Ok, in a F/G pool, with a T/A of 160, stop worrying about T/A. Like a vinyl pool, anything below 180 is effectively normal. If your pH is in the 7.3-7.8 range, you are done (re: T/A). If your pH is 6.9-7.2, aerate to raise pH back over 7.3 without raising T/A, but that's all.

Now worry about the other stuff...

Pretty much nothing else to add to Dave S's recommendations.