Sorry, I keep promising to sort out all the FAQ's etc as part of my new modding duites?
The higher the setup, the more anti roll you get. The more anti roll you get (like an ARB) the more that end slips. If you find the rear too sharp on corner entry then drop the rear 5mm. I would keep the difference between 5-15mm and if you need more then look to other parts of your suspension. The lower the car overall, the slower the weight transfer, the highter the car the faster the weight transfer. For our cars, slow weight transfer causes more understeer in low grip situations (Wet roads) but fast weight transfer causes more instability in high grip situations (Dry tarmac). I've trid a few differnt spring rates and a 335mm front drop suits me best for a poor weather and roads in the UK. My rear setup is a function of Springs, rear ARB, front castor(!) and corner entry speed. A 40mph corner benefits from a higher rear than an 80mph corner that feels unstable.