If you already have the bubbles, just try and push down on it with your thumb. It might help a little bit. If you're daring, you could take a razor blade and cut a tiny hole in some corner. That will give the air bubbles a place to escape. Course, it's not recommended for huge bubbles. Worth a shot if you can't stand how your tint looks right now. But try just pushing it in first. For the bottom of the rear window, take a plastic paint scraper covered with a soft paper towel. Use that to push in the tint.
As for New York, try Art of Tint. Shop is somewhere in Brooklyn and midtown West side. Have no idea what that means as I'm not from NYC. Could be two places, could be one. Dunno. Tom is supposed to do a great job though.
Huper is a ceramic based tint. It rejects heat much better than regular tint. I think 40 or 50% Huper already rejects more than limo tint of a regular type film. The lowest they go is 20, but 30 is what you'll realistically find to be the lowest. It is expensive. 5 windows in NY costs $450 for a Volvo S60R. Prolly the same for a BMW.
If you insist on tinting your windshield, I'd suggest V-Kool in the 75% film. 70% at most. V-Kool is similar to Huper in heat rejection properties, but it's metallic based so it may slightly affect radar/radio reception. Plus, it's kinda shimmery at certain angles like all metallic based tints. But, it comes in those really light shades so hopefully law enforcement won't notice. V-Kool at 70% blocks more heat than a regular limo tint too. But, V-Kool is fractionally more expensive than Huper.