leg supports

The first time we put this together and put water in it. One of the corner joints was ready to come out so we followed the advice I had read on this forum and drained it so that we could make sure the legs were good. It looked like the legs on the pump side were straight up and down and sinking...

Currently setting up a 15’ x7’ (4.5m x 2.2m) rectangular intex pool. Pool has been placed on 0.75 inch (20mm) XPS foam which sits on grass. Lawn was levelled last summer so no issues with that. My question is regarding pavers. I’ve seen a lot of threads regarding their use but all seem to apply...