You said you have a plaster pool? That changes things.
You need to start lowering your T/A to 120-125 as your upper limit. For a vinyl pool 180 seems to be the safe upper end.
Look up our thread on lowering T/A via the ratchet method (you "ratchet" it down).
You lower pH with acid, which brings T/A down with it. Then you aerate to raise pH without T/A rising again.
Now you "ratchet" T/A down by lowering pH again, then aerating to raise it.
I'd aim for 100 as my target if I were you.
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