56 I' kind keeping it low at that level enough to make a harem but not too high to make bimbos and an evil MC.
Player corruption has no impact on that... and neither does Girl corruption... you'll turn them into needy Nymphos with high corruption... but they still have their own personality. BIMBO means to me to be a mindless, always gigling and happy girl, displaying low to no level of intelligence btw.
At best you mellow their jealousy down so they accept shareing the MC (all orgy type scenes require an increased girls corruption).
Also I corrected my post just now since Alignment != Corruption in the Players case.
Personally I would have preferred to play with 50 alignment, but currently you need that value to be 71 to see every scene the game has to offer (well 70 to see the church scene, but triggering that raises alignment and corruption by 1)