Same problem here, using the F-86 pit; I don't think the pit comes into it.
Anyway:
The nosewheel rises by itself at 96kts, and the aircraft begins to oscillate fore-and-aft at around 115-120kts. Tyre-squeals begin at around 150kts, which is when the airbrakes fly off - starboard first at 151kts, port immediately afterwards. The wheels leave the ground at 158kts followed immediately by the explosion - or fire, followed by the explosion, once.
The figures are from one full-power test run. In the other, I reduced speed before take-off when things started to go wrong, and caught fire instead.
Talking of skins, are you releasing that RAF one?