Congrats on the low ET, $250 is not bad for a fun night at the races.
Tire shake happens when the slicks hook up then spin, then grab then spin, grab etc - they can get very violent.
I doubt it had anything to do with the VHT never seen toomuch of that stuff be a bad thing if applied correctly, it probably was the combination of a light burn-out and the absence of rubber on the track.
Usually a quick bleep of the throttle will settle them down enough so they'll go ahead and bite - just make sure you got it pointed straight when you do it.
BTW, where is this cool airstrip at? I always wanted to run down one of them suckers.
Cp