Looking good!!!
You're doing a fantastic job.
My recommendation is to use the cove material, having a 90 deg. corner is not the best of choices, the cove transitions the load (Weight of water) better and also gives you piece of mind that all that weight doesn't push through a small crack left between foam and wall, if there is even a small gap, the weight of the water will eventually push the liner in there as if it was saran wrap (with or without duct tape), so the cove would cover any such potential spots.
Also, a cove gives a better transition to allow your kreepy crawley to climb the walls.
With regards to the inweard lean of the straight wall - in my opinion, all oval pools should be built that way, I call it preloading, once all the water weight start to push, your wall WILL lean out some, so by preloading, your wall should become straight once the pool is filled.