In case anyone stumbles upon this thread again, the issue is definitely with the Lycanite's Mob version that is in the default Monster pack. Update the mod and everything should work. And thanks to the Lycanite's Mobs mod developer for adding a global (Lycanites) spawn rate config setting in the newer versions of the mod!
I posted a thread on how to update found here: http://forum.feed-the-beast.com/thr...ot-spawning-with-lycanite-mobs-enabled.45226/