Auto Subs (Help)

I wantmy Running backs to be a one two punch, so I go into the coaching tab and into Auto Subs. I increase it so that it is like 90 sub in and 95 sub out. And still my number 2 back never gets subbed in, can anyone help me out so taht they split carries 50-50. I DON'T want to manually sub them in and out, so please give me sliders for the auto subs. Thanks!|||This is relevant to my interests|||Please anyone?!?!|||If u set the sub out to 90 it will sub the RB out when his stamina drops to 90. Then if u set sub in to 100 they will go in when it reaches 100|||Thank you!!