I ran a bunch of calculations on this at the thread below. You can change your front calipers to the larger piston versions or search for a smaller master cylinder piston diameter. I sold my Wilwood 1.4" diameter calipers for about $140/pair and bought the new ones for about $150 each, should bolt up to what you have if both Superlites. It also corrects your front-to-rear bias.
Front to Rear Brake Bias