diff --git a/Core/HLE/proAdhoc.cpp b/Core/HLE/proAdhoc.cpp
index 94b5fe205888..b2419a799096 100644
--- a/Core/HLE/proAdhoc.cpp
+++ b/Core/HLE/proAdhoc.cpp
@@ -1241,7 +1241,7 @@ void notifyMatchingHandler(SceNetAdhocMatchingContext * context, ThreadMessage *
 	// Don't share buffer address space with other mipscall in the queue since mipscalls aren't immediately executed
 	MatchingArgs argsNew = { 0 };
 	u32_le dataBufLen = msg->optlen + 8; //max(bufLen, msg->optlen + 8);
-	u32_le dataBufAddr = userMemory.Alloc(dataBufLen); // We will free this memory after returning from mipscall
+	u32_le dataBufAddr = userMemory.Alloc(dataBufLen); // We will free this memory after returning from mipscall. FIXME: Are these buffers supposed to be taken/pre-allocated from the memory pool during sceNetAdhocMatchingInit?
 	uint8_t * dataPtr = Memory::GetPointer(dataBufAddr);
 	if (dataPtr) {
 		memcpy(dataPtr, &msg->mac, sizeof(msg->mac));
@@ -1255,6 +1255,7 @@ void notifyMatchingHandler(SceNetAdhocMatchingContext * context, ThreadMessage *
 	}
 	else {
 		argsNew.data[1] = PSP_ADHOC_MATCHING_EVENT_ERROR; // not sure where to put the error code for EVENT_ERROR tho
+		//argsNew.data[2] = dataBufAddr; // FIXME: Is the MAC address mandatory (ie. can't be null pointer) even for EVENT_ERROR? Where should we put this MAC data in the case we failed to allocate the memory? may be on the memory pool?
 	}
 	argsNew.data[0] = context->id;	
 	argsNew.data[5] = context->handler.entryPoint; //not part of callback argument, just borrowing a space to store callback address so i don't need to search the context first later
diff --git a/Core/HLE/proAdhoc.h b/Core/HLE/proAdhoc.h
index e725950fa36a..f1e8e0dd06cf 100644
--- a/Core/HLE/proAdhoc.h
+++ b/Core/HLE/proAdhoc.h
@@ -732,7 +732,7 @@ enum {
 #define PSP_ADHOC_MATCHING_MODE_P2P				3
 
 // Matching Events
-#define PSP_ADHOC_MATCHING_EVENT_HELLO			1
+#define PSP_ADHOC_MATCHING_EVENT_HELLO			1	// Should be ignored when Join Request is in progress ?
 #define PSP_ADHOC_MATCHING_EVENT_REQUEST		2
 #define PSP_ADHOC_MATCHING_EVENT_LEAVE			3
 #define PSP_ADHOC_MATCHING_EVENT_DENY			4
diff --git a/Core/HLE/sceNetAdhoc.cpp b/Core/HLE/sceNetAdhoc.cpp
index 12bbe547525a..a97fda72df07 100644
--- a/Core/HLE/sceNetAdhoc.cpp
+++ b/Core/HLE/sceNetAdhoc.cpp
@@ -4674,7 +4674,7 @@ int sceNetAdhocMatchingDelete(int matchingId) {
 }
 
 int sceNetAdhocMatchingInit(u32 memsize) {
-	WARN_LOG(SCENET, "sceNetAdhocMatchingInit(%d) at %08x", memsize, currentMIPS->pc);
+	WARN_LOG_REPORT_ONCE(sceNetAdhocMatchingInit, SCENET, "sceNetAdhocMatchingInit(%d) at %08x", memsize, currentMIPS->pc);
 	
 	// Uninitialized Library
 	if (netAdhocMatchingInited) 
@@ -5746,23 +5746,34 @@ void __NetMatchingCallbacks() //(int matchingId)
 {
 	std::lock_guard<std::recursive_mutex> adhocGuard(adhocEvtMtx);
 	hleSkipDeadbeef();
-	int delayus = adhocDefaultDelay;
+	// Note: Super Pocket Tennis / Thrillville Off the Rails seems to have a very short timeout (ie. ~5ms) while waiting for the event to arrived on the callback handler, but Lord of Arcana may not work well with 5ms (~3m or ~10ms seems to be good)
+	// Games with 4-players or more (ie. Gundam: Senjou No Kizuna Portable) will also need lower delay/latency (ie. ~3ms seems to be good, 2ms or lower doesn't work well) so MatchingEvents can be processed faster, thus won't be piling up in the queue.
+	// Using 3ms seems to fix Player list issue on StarWars The Force Unleashed.
+	int delayus = 3000;
 
 	auto params = matchingEvents.begin();
 	if (params != matchingEvents.end()) {
 		u32_le *args = params->data;
-		//auto context = findMatchingContext(args[0]);
+		auto context = findMatchingContext(args[0]);
 
 		if (actionAfterMatchingMipsCall < 0) {
 			actionAfterMatchingMipsCall = __KernelRegisterActionType(AfterMatchingMipsCall::Create);
 		}
 		DEBUG_LOG(SCENET, "AdhocMatching - Remaining Events: %zu", matchingEvents.size());
-		DEBUG_LOG(SCENET, "AdhocMatchingCallback: [ID=%i][EVENT=%i][%s]", args[0], args[1], mac2str((SceNetEtherAddr *)Memory::GetPointer(args[2])).c_str());
-		AfterMatchingMipsCall *after = (AfterMatchingMipsCall *)__KernelCreateAction(actionAfterMatchingMipsCall);
-		after->SetData(args[0], args[1], args[2]);
-		hleEnqueueCall(args[5], 5, args, after);
-		matchingEvents.pop_front();
-		delayus = adhocMatchingEventDelay; // Add extra delay to prevent I/O Timing method from causing disconnection, but delaying too long may cause matchingEvents to pile up
+		auto peer = findPeer(context, (SceNetEtherAddr*)Memory::GetPointer(args[2]));
+		// Discard HELLO Events when in the middle of joining, as some games (ie. Super Pocket Tennis) might tried to join again (TODO: Need to confirm whether sceNetAdhocMatchingSelectTarget supposed to be blocking the current thread or not)
+		if (peer == NULL || (args[1] != PSP_ADHOC_MATCHING_EVENT_HELLO || (peer->state != PSP_ADHOC_MATCHING_PEER_OUTGOING_REQUEST && peer->state != PSP_ADHOC_MATCHING_PEER_INCOMING_REQUEST))) {
+			DEBUG_LOG(SCENET, "AdhocMatchingCallback: [ID=%i][EVENT=%i][%s]", args[0], args[1], mac2str((SceNetEtherAddr *)Memory::GetPointer(args[2])).c_str());
+		
+			AfterMatchingMipsCall* after = (AfterMatchingMipsCall*)__KernelCreateAction(actionAfterMatchingMipsCall);
+			after->SetData(args[0], args[1], args[2]);
+			hleEnqueueCall(args[5], 5, args, after);
+			matchingEvents.pop_front();
+		}
+		else {
+			DEBUG_LOG(SCENET, "AdhocMatching - Discarding Callback: [ID=%i][EVENT=%i][%s]", args[0], args[1], mac2str((SceNetEtherAddr*)Memory::GetPointer(args[2])).c_str());
+			matchingEvents.pop_front();
+		}
 	}
 
 	// Must be delayed long enough whenever there is a pending callback. Should it be 10-100ms for Matching Events? or Not Less than the delays on sceNetAdhocMatching HLE?
diff --git a/Core/HLE/sceNetAdhoc.h b/Core/HLE/sceNetAdhoc.h
index 9027012b850e..114e7cec726a 100644
--- a/Core/HLE/sceNetAdhoc.h
+++ b/Core/HLE/sceNetAdhoc.h
@@ -24,7 +24,7 @@
 #pragma pack(push,1)
 #endif
 typedef struct MatchingArgs {
-	u32_le data[6]; //ContextID, Opcode, bufAddr[ to MAC], OptLen, OptAddr[, EntryPoint]
+	u32_le data[6]; // ContextID, EventID, bufAddr[ to MAC], OptLen, OptAddr[, EntryPoint]
 } PACK MatchingArgs;
 
 typedef struct SceNetAdhocDiscoverParam {