Hey Aaron, I found your initial auto-subs to be pretty much spot on, so I hope you don't get slideritis with these.
They work great, and I appreciate them.
Really, the only observation I can bring up is that maybe the backup RB getting 3-4 carries rather than 1-2 when subbed in for the starter. If I understand this correctly, would 90/91 affect the RB subs in that way?
EDIT: I also find 60 fatigue the best balance as well.