Auto-Sub Question...

[humpdump66]

I'm not sure if this is a game-problem or a me-problem, but my auto-subs don't seem to be working. I have kept my auto-sub defaults the same, yet even after my rb's (for example) have fatigued far below 60%, they remain in the game. In the Call Play screen that lists possible plays to call (on the left) and key players used in that play (on the right), a different RB will be listed than the one that actually participates in that play. Am I doing something wrong, or do the auto-subs not work?

Also, how do you audible from the kick return formation to the onside kick return formation?

[True Talent]

I'm not sure of the auto-sub's because I always use the Spell HB package to give my RB a breather.