Re: tinting my car with 65% tint all.
I used Huper too. Ceramic and the back window was the highest it could be, the back side windows were the highest it could be (5% less than the rear window I think), then the front side windows were supposed to be another 10%(?) less than the rear, but I chose to keep side windows at the same tint (did not want that horrible difference in shade) and the front screen complies.
So, my only problem come inspection time, will be the front side windows.
No ugly ERP cut out, no GPS or Satnav problems and no tint in my transitions spectacles which are supposed to go dark in sunlight and act as sun glasses.