Check to see if you have COFH Core installed as a mod. If so go to "minecraft\config\cofh\core" and open the loot.cfg
Change:Code:B:MobsDropOnPvEOnly=true To: B:MobsDropOnPvEOnly=false
Random thought that could be getting in the way, figured I'd mention it.
EDIT: for clarification you SHOULD have this mod.
This is specifically for head drops, and will allow them to drop even from falling deaths. (if no other mod interferes somehow.)
Thanks for giving me hope, but it didn't work. That config was the only one I didn't try while trying to fix the issue because I was thinking it was for loot in chests. I change the option you recommended, but it didn't work. I did notice that in the same config the WitherSkeletons { I:Chance=5 B:Enabled=false is set to false, so I set it to true, but again no luck.
There was another config "CoFHLoot" that is the same thing just typed up different, and I changed the same config you said to, but also no luck. That config also had WitherSkeletons set to false, so I set it to true. The last thing I tried was just remove the entire CoFH config folder, but that didn't work either. I would like to add when it replaced the config it didn't add back the 10 other configs that were in the main folder. I just deleted it and put back in the backup I kept.
Thanks again thou, it did really give me a few more hours of motivation to continue to try