1.) I, 100%
2.) I, 100%
3.) I, 80%
4.) I, 60%
5.) II, 100%
6,) II, 100%
7.) II, 80%
8.) III, 100%
9.) III, 100%
10.) III, 80%
11.) IV, 100%
12.) IV, ??
13.) IV, ??

Someone good with numbers can try to convert that from shield to the full 44 stat upgrade on other weapons. And yes, IV is only one stat point. =x