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.