I use an old Foley Belsaw grinder which doesn't have a lot of choice on adjustment. I use Foley's grinding wheels, 3/16th for 3/8 chain and 1/8 for .325, they last for years and years grinding my own chains. I rarely sharpen for anyone else, too much of a pain in the arse,,mf's wanna' bring me a chain that looks like they've used for a rotor tiller.
I grind everything at 30 or 35 degrees.
Tips/tricks I've picked up:
Dress the wheel often. Keep the profile round.
Just barely tap-tap-tap lightly, Don't overheat the cutter!! I usually go around the chain just touching each tooth a couple taps then move to next tooth, going around the chain a few times until I bottom out on the "down stop/depth" adjustment of the grinder. (I grind the gullet deep)
I don't clean my chains
That's my take on it, hope it helps..