Hi bc, it's weird seeing you on that side of the board. Anyway, I installed my own tinting on my truck, and the main thing while doing the installation was to keep everything WET. This allowed for movement of the film, which I had to occasionally go back and adjust due to bubbles. So my best guess is to SOAK the ?@#$ out of it and work the film around by hand until it comes loose. I used "Glass Plus" when doing the install, although they suggested water. Considering that you've already made some openings with some of the bubbles, I'd utilize those areas to allow some of your moisture spray to soak through and behind the film.
One other thought. Maybe if you approached this like wallpaper removal (making numerous scores for the moisture to seep through) might do some good. Hope this helps, at least to give you a few more ideas! Wick