Option A.) Don’t use too much soap in your slip solution.
Option B.) Go the extra mile when it comes to prepping the window. Scrub harder, and make sure to hit the small dots before installation.
Option C.) Do not over shrink.
Option D.) Do not use sandpaper.
Option E.) When prepping the window, use steel wool, then clean thoroughly with water before wiping with a paper towel. Go over the window with a final clean of isopropyl alcohol, and the film should no longer peel.