Ok, so I haven't tested this toooo much, but here's what I found out.
#1) While the multiboard shows +exp bonus, it doesn't actually give a bonus. I killed a thing, got 10 exp with +115% exp bonus. Took off all the gear, had +0% on multiboard, still got 10 exp from same monster.
#2) Long story short: PERHAPS ITS THE RING?
but with that cool ring that lets you get +2 levels over current chapter, I was able to get to level 27/20 in chapter 4 @_@
Long story long:
In Ch1, I beat the epic boss and let him live, getting the uber ring that gives +exp and lets you go +2 levels over chapter limit.
In Ch4, I was like 'OK, I'm gonna go cap my level, then take off this ring so I have another slot for epic/elite bosses!' 'Woo, these mutants infinite respawn!' 'ok, I'll sit here for like 2 hours just farming XP so I can have this slot free and be 2 levels higher so I can really kick their asses' 'wow, been doing this forever, I wonder what the level cap is for this chapter' 'HOLY HECK I'M LEVEL 27/20 WHAT HAPPENED?!?! @_@'
#3) Flower count lies in chapter 4
says you can get 20. Finally I opened editor, and found YOU ONLY HAVE 18
I was looking for the other 2 for no good reason
. (8 Bahm, 10 Posamenian) Please add 2 Bahm or change count to 18