Auto Subs/Coaching Schemes Help

[romschomp]

How does autosubs work? is it the lower the less subbed higher more subbed? but what is the gap that you can create like ex. 80-85
Im looking to make a three headed beast on the run similar to the Saints offense so what would I typically do to emulate that?
What range of subs would I use for games like pro bowl and preseason for everyone to get proper time etc.

Coaching priority in positions, what does it do? ive heard it generally shows how a player reacts to a play but why would I not just keep it at 100 in that case? ive seen all types of sliders that show different positions at 40-20 etc. I dont understand why you would do that if theyre gonna react slow. Ive played franchise for hours on end and never understood it..

ANNND do these changes take effect in simming other than playing?

Help greattly appreciated,