Your CYA will drop ONLY when water is drained from your pool OR when algae+bacteria 'eat' it. You don't want the 2nd option, since some of the time, the bacteria 'poop' ammonia, instead of nitrogen gas.

So, you need to be careful to maintain Best Guess chlorine levels. Other than than, so long as your pH is in range, all should be well.

I would recommend keeping your pH in the 7.0 - 7.2 range, till your TA drops below 110 or so.