I am talking about the levels before Vanna. I find Vanna completely fine how he is.
Anyways, for end game levels i find FSC easy. I know what the lore says but i think that there should be more monster variety besides undead and a few slimes, trojans, and wolvers scattered in.
I think there should maybe be some kats put in and replace the flame puppies with fire Howlitzer. Also maybe put more ash tails in there.
They could put some slags (the guards that vana sapwn on final satge) here and there. They are totally annoyng and will make it hader.
Or maybe some zombies could have shield on their backs, like n the SL version.
The difficulty is good enough for most people anyways. Sure it gets easier with time and practice, but 'pros' can go to darkfire vanaduke.
I wouldnt tweak FSC much.