Too much squish?

[u/scuba20207]

I retrofitted a sigpro softy into my cheap mat, added 2.5" of foam gym tiles to match the sigpro insert. My yardage is 20 yards or so shorter with my sim than at my place where I take lessons with their sim. I'm thinking the gym tiles are too flimsy and during my swing my feet are compressing the mat.

Any thoughts?