You could try some heavier shock oil in the rear or lighter in the front. The heavier shock oil in the rear will cause the rear to react slower. The lighter shock oil in the front will cause the front to react faster, hopefully keeping up with the rear so they spring equally. Maybe try backing off on your spring setting in rear too. Some people say the spring settings only adjust ride height but others say they affect the preload of the shock, causing more or less bounce. Maybe someone with more knowledge will chime in. Good luck regardless!