I don't have the EMPI brakes, but I do have 4 wheel discs, and the same M/C.
I could get a hard pedal, but low with standard bleeding practice of push down, hold, bleed, close bleeder, then release pedal. Repeat......check fluid, DON'T LET IT RUN DRY!
I could not get the pedal to be where I thought it should be. Until I VIOLENTLY PUMPED THREE TIMES, and held on the third pump. The amount of tiny bubbles that trickled out were miniscule, but there. That was the only way to get all the air out. Try it, Ed.
I always bleed with a clear hose over the bleeder into an old brake fluid bottle. The bottle has a mechanic's wire cage wrapped around it with a convenient hook for brake hoses or suspension parts. It's so easy to see the air coming out with the hose, or lack of air when you get it all out.
If your pedal comes up on second pump higher than the first pump, you've still got air. If the pedal height stays the same no matter how many times you pump, but it's low, you've got a mechanical issue with the pedal ratio or M/C size versus caliper piston size.