Congratulations...it sounds like you are there. If you want to be absolutely sure you could do an overnight FC loss test (you have to turn off the SWCG to do this).
Other than that, yes it is time to turn down the SWCG and add enough CYA to get to 70.
SWCG's tend to cause pH to rise. The higher the TA, the faster this will happen. To lower high pH you add muriatic acid, which will also lower TA slightly. Over time your TA will get down to a level where you pH is more stable (60-70 probably). You can expedite this process, but it is not necessary. There is a pool school article about lowering total alkalinity.