I don't know about the "buckets". I think whatever stat boosting item you have equipped, your stats will only be boosted based off the highest item, much like AC in BG. So if you had an Amulet with +2 Might and +1 Resolve, and also had a pair of boots with +1 Might and +2 Resolve, then that would total out to +2 Might and +2 Resolve, as the other stats are "suppressed" (which you can view on the character screen)