Question about adding wheel extenders to the rear of my mbx-5 on road project

[transtalon]

I know based on my buggy which is built for top speed that with the extended wheel hex it was more stable at high speed and it sure does not rollover like before. I am running a 43spur/25 pinion, 80 mm 2000kv medusa,
6S 5000 flightpower Evo25, and a PMT rally tires which is the best on road tires I have use. It doesn't balloon up and it gets softer like a drag slick after a couple of speed pass.