We have had TONS of cars come in after getting an alignment done at a dealer and it "just not feel right" to the owner. And we still have them come in to this day.
It is always best to take it to a Corvette specialist , you can tell a BIG difference when it is done properly.
It may cost a little more but it is well worth it!!
There are MANY things it could be and GMJUNKIE is right about most of them not caring !!!
Good luck!! I am sure GMJUNKIE will be able to fix you up.`