It's a combination of pedal ratio and MC size.

I went through the no-stoppy thing when I dropped a truck MC on the "big" Dippy rotors. Stopping the car required both feet on the pedal and my butt in the air. It was pretty hard on the steering column too. That MC was WAY too big and caused a super-hard pedal.
When I went to the larger calipers, the MC was the perfect size and the pedal effort dropped to normal.

Dropping the bore of the MC will reduce the pedal effort.
Maybe one of the K-car MCs would work?

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon