[Overdrive]

Topless is right, here. And seeing as the dealer had their hands on it last, best to bring it back to them and ask them wtf. Given the last thing you said about it happening even on a straight line launch, something's definitely up and it's not you. I couldn't imagine this car doing anything other than going-going-going when launching straight...that's kind of a scary thought, so I can't even imagine how you feel actually experiencing it.

Mounts and/or alignment, at this point it has to be one of the two since those are what was worked on. But either get it back to the dealer or hopefully find a good independent Porsche specialist in the area. You don't want to find yourself in a situation where you need the car to handle properly and not have it able to.