I'm not quite clear on the mechanics of set bonuses. The little that I do know is pieced together from the translated Japanese Wiki. From what I understand having a set bonus between a line shield and a melee or shooting weapon nets you a 25% increase to Attack Power, Defensive Power and Accuracy.

Does this bonus take into account your own personal stats? Or only those of the weapon and shield line?

Let's say I'm using a line shield and a 1 handed weapon which have a set bonus with each other. For example the Ageha-senba and the Ageha-kikami. Now you can dual wield the cards with either a melee weapon or a cane; would that set bonus only be active while I hold down the right shoulder button and I'm therefore using the Ageha-kikami or would be also active when I use the righthand weapon?