[axsaxoman]

start with setting ride heights ,having the rear too low ,in relation to front height will always make it tail happy --once you have that set and play with f+r tyre pressures ,then look at bar sizes .
even a soft sprung car should have BALANCE ,ulitmate grip is then got once you have the balnce right for your driving style.
ina straight line rar wheels should be JUST locking before fronts .but we are talking fractional amounts her .so if its been lowered and load sensor on earr has not been adjusted correctly you will have too much rear brakes.
the purpose of the sensor is to allow more rear braking as suspsnion is compressed at rear ,when you have car fully loaded.so get that right as well