I would not use Gorilla Glue. It's a good product but you shouldn't need it. The adhesion promoter helps ensure a good bonding surface. All wax and other stuff will be removed. Your tape should hold just fine. My quarter window louvers have been on for 4 years and there's no hint of them coming off. If you want a wider tape then get it. But you shouldn't need the glue.
I agree with being careful how tight you tighten the bolts for the scoop. You need to maintain even pressure.
Make sure the surface is nice and warm in addition to being clean. This makes a difference. Likewise, the surface should also be dry, and kept dry for a few days afterwards while the tape fully sets.
Bottom line, just follow your directions to the letter.
06 GT Premium, Windveil Blue, Auto, IUP
Mods: Midwest Auto Gear Engine Plenum Cover, Sequential Taillights, Demolet Tunable CAI & SCT Tune, CDC Quarter Window Louvers, Billett Aluminum Interior Items, 8" Shorty Antenna, Powder Coated Valve Covers, Braided Hoses, Flowmaster AT, California Dreamin' Hood, CDC Classic Chin Spoiler, Honeycomb Rear Decklid Blackout Panel, 35% Window Tints, SHR Lower Grill Inserts