I've got a Miami Classic for my P30. I don't really need to carry 45 rounds around...
Has anybody tried the off-side tie down they have for it? Does it make it feel incredibly off-sided, or does the tie down take care of that?

I have a similar shoulder rig without ties. I put 1 additional filled mag and a pocket multi tool leatherman in the ammo holders to try to balance it out. I have some tie downs I may try later...