You can just remove the mineral pac and continue to use the trichlor pucks in the pool, but the trichlor is very acidic and is adding to (if not creating) your low pH problem. I can't tell you how many more boxes of Borax you need, but if two didn't make a dent, then I would at least get 4. Since you don't know how low your pH is, it might take quite a lot of Borax to get the pH back up into range, but this is crucial, because low pH can damage, or destroy, your liner.
Most people that have 2 speed pumps, generally run them on low speed, except when backwashing sand filters or running a cleaner--and unless you're trying to kill off an algae bloom, it doesn't need to run 24/7. It only needs to run enough to turn your entire pool volume over in a day. For most folks, that means 6-8 hours a day is plenty, depending on your pump.
The measurements of your pool ordinarily would equal over 21K gallons, but the 54" depth is misleading--that's actually the total height of the wall, not the actual depth of the water. In most filled pools, your actual water depth is more like 48", which would put your pool volume at 18,400 gallons (roughly).
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