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Not sure if I understood the question right,but if its on the burn-out with the Pro-Mods running they might have prep the starting line & track a little better than it was 2 weeks ago.If it is doing it at the end of 1st gear going down the track I would think it was in the drive train,not the tires.A Hi-Horse-Power light weight car can spin the tires & cause a shake,but most times they do it at the torque peak.

PS just for the hell of it jack the rear end up,get you a coffee can tape a piece of soap stone on the top of it and set it close to your rear tires and see if one of your tires has got out of round.

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