The HP Supreme 35 looks good on the front... but to be honest, I didn't have it on my car long enough (as in about 15 mins) before the rear HP Quantum 52 was applied.
As you've mentioned, the rears are only measuring at around 40%, the fronts at 75% with no tint. Whilst (most? all?) tint manufacturers rate their tint "installed" (meaning, no glass is 100%, so the 35% is what you'll get after installed on "glass"), the front windows WOULD BE DARKER than the rear windows if you simply put a 35% tint there. So the rears need "something". "Clear" tint, such as the Solargard LX70 is also still not "100%" - in fact, it's only 72%. So maybe if you got your front windows with 35% and at least got a "clear tint" on the rear, that would be enough to equalise. But... I'd go with your installers advice maybe
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