About the 3M dual mounts...
Some already said this, but once again, I will emphasize. Wait a day or two for the glue behind the Dual Mounts to cure. Instead of NOT riding the cycle, this is a no brainer, line everything up and don't put the lip on for a day or two.
BTW, you also got good advice on getting the surfaces apart. A small pen knife works ok too, but don't try to pull the surfaces apart at 90 degrees. You are actually trying to break the seal between the two 'pads' so pulling apart is easier (do one at a time) and not weaken the glue.