How does the trapdoor monster levels effect drops? Is it something to look for now?
Hard for me to put this in words:
If you are level 15 and fall into a trap door, the monsters will be the same as you being level 20 and encountering them, the drops will be the same as if you were level 20 and facing those monsters. Also note that the Catacomb dimension will also increase.
As for 200% minimum, that just means higher level catacomb monsters.
Hope this sort of makes sense, personally I don't explore Trap Door catacombs, but have done on occasions at level 1, and noticed the dimension of catacomb was larger than 5x5.