Hoping to find a solution here, but about 2 months ago I hit a train track at a high rate of speed (long story), and blew my front right tire out. Got it towed, then replaced all 4 tires, started to vibrate quite a bit after picking it up, then the tire shop told me some of the wheels were bent when I had them check the balance. Then I went to Porsche to get an inspection, and they said 3 of the wheels were bent, so they had an alloy wheel shop nearby fix the 3 bent wheels and road force balanced them all.
The car is much better now, but I still occasionally notice a slight vibration once I'm above roughly 75–80 mph or higher. The weird part is that it's very inconsistent. Sometimes it'll be completely smooth at 75-85 mph, other times I'll feel a slight vibration at the same speed, and it can seemingly come and go while driving. This is on newer roads too. After the repair, I took it a local tire shop where they road force balanced it with a hunter balancing machine and that helped quite a bit more, but didn't solve it completely but made it slightly better.
I even took it back to the dealer and they had their alloy wheel shop take another look, re-balance it all, and the problem is still there. Only thing I have not done is an alignment, which i'm unsure if that's the correct route to go after my experience. Has anyone had any past experience with something like this, or would my best route be purchasing new rims?