I have been using 5 of one set and 4 of another. With dual wield, and it was giving me the 4 piece bonus until now. Maybe it took me awhile to notice? Not sure. Anyways, the game used to give the 4 piece bonus, now is only giving 3 piece bonus. Maybe it was to make even for two handed or staffs& bows? Anyways, it seems not as much incentive to dual wield anymore if not getting the extra bonus. Maybe my game is just messed up? PS4 NA anyone else having this issue?