I have been using a 7200 331g lipo and needed to move the esc and receiver further out and add 10g of lead to balance the car.
Car was 70g overweight.
I tried a 295g 6000 lipo which allowed for balance without any lead and receiver as close to center as possible.
Power wise lighter car was faster with 13.5 boosted and the car was less prone to traction rolling.