Putting a heavy poly tarp (black/silver type, rather than the blue) between the insulation and the pool will help.

If you to see what I mean, take a bit of the pool patch material, and set it against a wooden board, and try to poke a hole through it with a fork. Then, move it on top of a piece of your insulation and try again.

(As a rule, product names are fine, as long as you aren't selling something or ranting. )