The foil tape won't do anything. I tried that and a year later I had to buy all new flexwatt because if you touched the flexwatt you would get shocked pretty good-and the foil tape made it even worse because it wasn't just in the one area that you got shocked, it was the whole dang thing. Find a way to get the shims in there, it should only make it tight in the back. I use composite window shims, not sure if that's what you have, but I really like them and you can cut them down so you are only using the thinner half.
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