It sounds like you are doing everything right...
Prep with Prepsol / Wax & Grease remover etc.
Wait over night at least for best result.
Apply tape (I always use the 3M outdoor tape as you mentioned, but try using a hairdryer / heat gun to warm both surfaces and the tape for better adhesion...
Other than that, not sure...
MY18 VW Passat Alltrack Wolfsburg Edition + Panoramic Sunroof + some extra goodies... (Pure White)
MY17 ŠKODA Superb 206TSI 4x4 + Sunroof + Tech Pack + Comfort Pack + some extra goodies... (Moon White)
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