hi i have 4 piece of +6 krowaz and 1 +5 piece in my set it shows all the bonus on my armor but in my character stat screen seems to only give me the str bonus from my armor and uniques not the extra 15 on each piece that the set completes or is 15 str bonus in total extra or is it per piece or do i need to have it at +7 or at a full +6 set for it to be active ?