Problems loading into vanilla server.

[Zilacon]

Alright so i run a network of many modpacks, my custom packs and other packs that have AM2 get errors trying to login to my vanilla HUB for my network. We have tracked down the issue to Animation API which AM2 requires for 1.7.10. Basically whenever someone with a modpack that has Animation API in it tries to join a vanilla server, this happens.

[B#353]  [12:41:27] [pool-4-thread-1/WARN]: Couldn't look up profile properties for com.mojang.authlib.GameProfile@47e9416b[id=43e54f6c-47d2-43cf-a133-cf020a5d337b,name=Zilacon,properties={},legacy=false]
[B#353]  com.mojang.authlib.exceptions.AuthenticationException: The client has sent too many requests within a certain amount of time
[B#353]  	at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:65) ~[YggdrasilAuthenticationService.class:?]
[B#353]  	at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(YggdrasilMinecraftSessionService.java:135) [YggdrasilMinecraftSessionService.class:?]
[B#353]  	at net.minecraft.client.resources.SkinManager$3.run(SourceFile:106) [brm.class:?]
[B#353]  	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_144]
[B#353]  	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_144]
[B#353]  	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_144]
[B#353]  	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_144]
[B#353]  	at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]

Is there any fix or work around for this? I really dont want to remove AM2 from my modpacks or other modpacks i intend to host servers for, as my players love the mod. Any modpack WITHOUT AM2 or Animation API can successfully connect to the HUB with no issues.

Any suggestions or solutions would be appreciated, thanks.
Animation API: 1.2.4 for 1.7.10
Ars Magica 2: 1.4.0.009 for 1.7.10