Interesting. Did you move the M80s as part of the re-arranging ? It sounds like the M80s were not in a good place for smooth bass, but taking the crossover up to 80 moved more of the bass to the sub which apparently *was* in a good place...

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8