also, if you're TA is wrong, as suspected, your pH will rise over time. I think it will rise just from the aeration effects of the SWCG as well
I wouldn't worry about the pH of 7.1, as long as it doesn't go lower
And in a vinyl pool, hardness is almost meaningless- wouldn't worry about that one either!
you do need CYA, or stabilizer, to help the SWCG maintain FC levels- check the SWCG specs, but probably need around 70ppm...

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