how did you cut out foam?

[Tiny]

There is a product called Motsenbocker's Lift Off Silicone Latex Caulk and Foam Sealant Remover, I have not tried it for your application. Do a search, you might squirt some down the cracks and see if it will help the bottom release.

Just a thought. Let us know the results if you try.

I bought some at BOW in Riviera Beach, FL.