You could swap out the front calipers for one of the aftermarket D52 options with a smaller piston area, thereby reducing the front brake bias relative to the rear, giving you a more balanced system.
Not that there aren't other options, however Wilwood has a 2-piston D52 caliper option with 6.28 square inches of piston area or their GM-III calipers with either 4.45 or 5.98 square inches piston area that you might consider. The D52's have bushings and are a bit more streetable, however only offer a ~7% reduction in piston area, whereas the GM-III's would be a more substantial difference.
I don't know of any rear caliper interchange options with larger piston areas, but that's not to say they don't exist.
Most hydroboost installations run a 1.125" bore MC or larger depending on the application, calipers, etc. I don't have a specific suggestion for MC, maybe someone else will, but your first order of business should be to balance your system, since nothing at the firewall will correct for that.
Tobin
KORE3
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