Hey Todd.
I am under the impression that the 2A and 3A hoods are the same. I had to buy a new hood for my 3A and the fit was pretty good after I modified the hinge a bit. It was not a height issue like yours, but it was offset and didn't line up well with the grille. I redrilled the hinge holes. If you bought a new hood, it likely came directly or indirectly from Omix Ada. The hinge could be mounted wrong.
Also, if you don't have grille welting installed, the hood will lean downward, but that may only be around a 1/2" or so.
Tim