lets try to look at this from a serious point of view.

1) any single feature that increases move 1 secondary stats without increasing by the same amount of higher move 2-3-4 secondary stats has absolutely to not be implemented in game at our current state.

2) about current caps, what i think is that increasing the cap for summon runes, magatamas and battle armor "upgrade" side would be actually a good move if and only if getting to level 9 magatamas and level 12 summon runes becomes way less expensive than now.

3) adding % tactics if limited exclusively to defense, resistance and life primary stats would actually be a good move, if instead it implies to add also ninjutsu and attack primary stats, no, would be quite bad.