I’ve reheated the iOpener many times and re-applied many times (timing to make sure I’m a little over the 2 minutes suggested). I also used a heatgun until the back was too hot to keep holding my hand on it (and then of course stopped at that point).
No matter what I do with the suction cup (I bought the full official repair kit) and spudger+picks, I’m not getting even a little separation.