tried to hang drywall on metal studs using fine thread drywall screws
(for metal studs that I got from HD) over the weekend. Everything went
OK except for one section of the drywall over one stud. What happens is
that the screws get to tight and then spin out before dimpling. The
screw heads are not even flush with the drywall surface (still sticking
out a little) when spin out occurs. I usually use a dimpler bit, but
even with a regular screw driver, I couldn't drive the screws after a
certain point to get the dimple. Any suggestions? As I mentioned, I
didn't have a problem with most of the job.

How much drywall are you putting up?

If it's a small amount, just push harder on the drill/driver so that
the screw threads do not have to do ALL the work of drawing the screw
head into the drywall.

From your description I would guess that the stud material is a little
weak & the threads strip out before pulling the head flush. Pushing
harder will help the screws do their job.

IMO the coarse screws that you're trying to drive thru the steel into
wood might be binding up when their minor diameter gets stuck in the
steel stud.

cheers
Bob