None of your questions are ones I can answer specifically, but I can make some suggestions in sorting among the answers.
1. Use the methods your pool mfg will warrant, if you can determine that.
2. Ask the seller / mfg for info about construction methods.
3. You can certainly dish the bottom a little -- probably even a foot -- IF you grade the slope evenly from the edges. Do NOT start the slope right at the edge of the bottom -- your walls and posts need something stable to rest on.
Keep in mind that almost always 'listed' pool depths are 'flood depths' and only correspond to the working or normal depth on an IG pool with a rim flow gutter. Most other pools (like yours) will have an ACTUAL depth that is 6" to 8" less than the listed depth.
Ben / PoolDoc
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