Baer experts chime in, rear brake issue

[Ripped]

I have the baer 13" / 6 piston caliper on the front, of my 'stang, and the baer ironsport (for the ford 9") on the rears.

I have backed out the wilwood proportioning valve all the way on the rears.
The front brakes badly outclass the rears.

I cannot go much larger diameter on the rears, due to the deep dish 17" rims.

Master cylinder is manual 15/16" bore, and works very well with the front brakes.

Maybe the caliper bore (area) is too small compared to the fronts.

Do you guys have a suggestion, on perhaps a different caliper that baer offers for the rears?

I already tried the online help for for baer, but an error message pops up, on submission.

Anyway thanks for any suggestions. I don't really want to move the proportioing valve onto the front system.