soft brakes and headaches

I have found the following street set-up very satisfying;
-the oem KH discs with braided lines and 10 x 2 drums
-the multiplier booster with a 15/16 m/c
-7/8 wheel cylinders
-no metering block and a gutted p-valve
-tires are 235/70-14 and 295/50-15 rears
- Car is at 3450#
-I didnt gut the p-valve until I put the 295s on. I found that tire size to be a very effective stopper back there.
-I found the smaller m/c to be a little more modulate-able