[Fordors]

I think you need advice from a circle track racer. Those guys will adjust front to rear brake bias similar to what you want to do, but they do it to adjust for track conditions. Loosen the jam nut for the front m/c push rod and adjust that push rod out; you will want to make the fronts come in first as something like 70% of braking force is from the front axle. Remember that you need a bit of clearance (about a 1/16") at the push rod to m/c piston on those fronts. Next, loosen the jam nut on the rear m/c push rod and screw that rod into the clevis, you might even have to remove and cut it down some. The front m/c will have pressure applied first and more than the rear and I'm sure this will take some trial and error on your part to get the desired effect. Once you have done this go to a deserted area, a parking lot, or your driveway (slowly) and test it out.
A racer would know more, but I think this will get you started. Or stopped, actually.