NBA 2K11 My Player Attribute Question?

In my player, my guy is 88 in shot inside, and 88 shot close, but when I go convert it to the graded attributes I have a C+ in the shot inside category. Now Elton Brand is 85 shot inside, and 88 shot close, and his grade is a B+. That kinda bothers me, is there any other attribute that affects shot inside that I'm missing? Please help!