Use a jump size of exactly the genesis window

ouroboros-consensus-diffusion/test/consensus-test/Test/Consensus/Genesis/Setup/GenChains.hs

@@ -130,7 +130,7 @@ genChains genNumForks = do
     -- ^ REVIEW: Do we want to generate those randomly? For now, the chosen
     -- values carry no special meaning. Someone needs to think about what values
     -- would make for interesting tests.
-    gtCSJParams = CSJParams $ fromIntegral $ scg `div` 2,
+    gtCSJParams = CSJParams $ fromIntegral scg,
     gtBlockTree = foldl' (flip BT.addBranch') (BT.mkTrunk goodChain) $ zipWith (genAdversarialFragment goodBlocks) [1..] alternativeChainSchemas,
     gtSchedule = ()
     }