[pwhitersxs]

^^ That is a pretty true statement. Why is there no mention on pads from the OP? Pads can play an importatnt role in braking power.

Also, not sure on what your master cylinder is, but that also plays a role on rear brake bias. After the split point, the line pressure decreases causing less force available to the piston. So look into getting a MC with something 40 units with a .2 ratio for increased rear bias. z31 is 40 units with a ratio of .4. Sorry no units, I forget them at the moment. Not sure on what master cylinder you are using, but look into a z31 or run new lines to run another type of master cylinder that is commonly used on nissan FWD applications. Using the z32 MC will give less rear line pressure because the split point is around 30 units I believe. Sorry, not at home and don't have the fsm's to be sure of units.