Web, this may be a little late for your timeframe, but most of what you've found is normal. Where your foot sank a little may have been an area that they patched that hadn't cured enough for walking on. The corners and bottom of the wall should 'tighten up' when the pool is full, the extra water pressure will make the liner conform better to the pool's shape. If the bottom is a vermiculite mixture, then water should be able to freely pass through it as you witnessed. With the rain you've been getting I'm not suprised that water was in the pool and that there is some behid the liner (you have a big hole in your backyard, mostly filled with the pool, but water seeks it's own level, and the lowest point it can get to, so you have the perfect recipe for flooding there) - add to this the fact that you have less than 1' of water in the pool and the rain water will collect between the wall and liner, at least till it's ~ the same level as the pool water, then it will try to push the liner around. As I said in a previous post to you, we try our best to trowel the floors as close to level as we can, but even the best trowler can have an off day, having no glaring dips or humps is about the best you can expect . Not being able to see your pool prevents me from commenting fully upon the quality of your pool, besides it's too easy to be a 'Monday morning quarterback'. Your PB should be able to address and allay your concerns. I hope that all turns out well and that you love your new pool!