No I wouldn't tint the bumper.
LOL!
Totally agree that 35% is not dark enough. I got nearly 10 years tinting experience under my belt and i HATED tinting cars in 35% haha
Not that im condoning going any darker than your states legal VLT, but in 10 years i have NEVER heard of anyone getting pulled up because their tint was too dark. Granted it would fail roadworthy, but doing the right thing on the tarmac, its very improbable you will get pulled up purely for your dark windows alone. (in Vic and NSW anyway haha). But thats not to say it hasnt, or wont happen.
I got 5% all round on my VT, and its fantastic. It is a little hard to see at night, but u get use to it. The only time it hinders me is when i have to reverse... but i just wind my window down
It also keeps my car significantly cooler being out in the sun all day, opposed to when it had 35% or none on it at all.
Having said all that, good luck finding a Tint-a-car shop that is willing to put darker than legal film on your car. Tint a car seem pretty strict around my region with that sorta thing. But im sure a cash in hand no receipt type deal might get you somewhere