IMO you need to tighten up the extension, I would start at maybe two from full stiff and soften up the compression to the middle. In other words about completely opposite from where it is now. Looks to me like you are hitting the tire hard and stiffening the extension on a ladder bar car would be the direction to go. The wheelie bars look OK once you get the hit under control. Plenty of power to ride the bars for a bit and set it down nicely. Would imagine with all that stifness on compression it cant be happy on anything less than a smooth track down track. Well those are my thoughts but your mileage may vary...