my results on 38 zr comp 575s
5 blade 31 Hering ..hard to get on plane, good mid range excellent top (no difuser ring)
34 lab 4 blade bravo better out of the hole, mid range not good, top end 2 mph slower than hering. (good all around prop)
5 blade hydro 32 same as 4 blade bravo
5 blade maximus 32 non lab great out of hole, good mid range, 5 mph slower top end.(clunked hard in & out of gear.)
with some seat time i liked the Hering the best.
the maximus may be good labed.
just my 02 cents....