A little update, i ran the car as mentioned in my last post yesterday apart from yellow springs on the front, white on the back and 4+2 battery layout for equal side to side balance. The car as a s*** lot better over rumble strips and landed well off the larger jumps, i'd say it was slightly quicker than the xx4's i was racing against over the rumbles

Never ever managed that before.
Biggest problem i had was getting on the power, anytime i came close to rubbing the throttle all of the weight was transferred to the rear and i lost all steering. It was like i needed droops screws on the front to limit the travel and keep the weight over the front or harder rear springs, neither of which i wanted to do as the car would be worse over th rumbles.
Didnt have time to try alot of things yesterday but after some consultation with the manual today i have a few things to try for next time, Less rear toe-in, long wheelbase, grey/yellow springs and a bit less ride height and droop all round.