I used to run 6s in my truggy, I was using 100k in the center to stop the fronts unloading which worked but the result was it would back flip with anything over 1/2 throttle.
It was so much work to drive that I dropped it to 4s and it's so much better. I do miss the stupid speed it had but it's actually faster on the track because I have more control with the throttle, on 6s the tinyest throttle movement would change the speed dramatically making it impossible to get the right throttle for the max acceleration.
Note, I'm running bigger wheels so my 100k would be the same as having 50k-75k on stock truggy wheels