I tried a square 275 setup for the track, and didnt like the balance of the car at all.
Made the rear end to light on corner exit with power on, car would oversteer like crazy.
Also car would understeer in some corners. not very predictable.
For a street car that you plan to drive home after a track day, stay away from the square setup. because if you crash it, its going to cost you
E9X M3 is normally a blast to drift and slide, but with a square setup, made it
unpredictable.
stagerred is the way to stay.