I would say start with the diffs and try 7-7-5 (Front-Center-Rear)
The truggy springs might be too stiff with different number of turns.
Front Shocks: Pink Springs (TKR6035) / 8x1.3 Pistons / 37.5wt oil
Rear Shocks: Red springs (TKR60340 / 8x1.3 Pistons / 30 or 32.5 wt oil
Good luck and have fun, its a great car