Wide and low .5 on the front blocks would probably be a better option. And you could try 2.6 all round or hard progressives on the front, springs depend on how bumpy the track is as well as traction levels. You also have big difference with the springs you are using front to rear and the shock angles, base point would be 1 up from in all the way round. As TryHard has said just start with standard wheel base. Ride height is also quite extreme front to rear, usually just run .2 different front to rear so 5mm f 5.2 rear, depending again how bumpy the track is.