He was at 8 going into midterm, got a 2.1 at midterm. I bump to 15, finishes the semester at 1.9 (so 1.7 in the 2nd half). All I know is, I'm seeing alot more volatility in grades on my teams. 

Yeah I followed that formula as well, and it worked without one fluctuation for about 6 months, and then in the last month I've almost lost about a dozen guys despite following it, and the one guy I actually lost, just like tianyi, was someone who was at 2.1; I increased minutes, and he dropped to 1.9
and yes to hughesjr I set SH minutes as soon as they get on campus, before the first exhibition game