The point of 200RPM over SWCG turning off is to give you some flow room for when the filter starts to get debris and will reduce flow.
That is a perfect way to use the SWCG.
You testing looks fine. Yes, pH is high, salt is 3600.
You only need some dry chlorine stabilizer and some muriatic acid. Would be ok to have a gallon or two of liquid chlorine on hand if you need to raise FC. SWCG is good at maintaining, not so good at raising.
Get the CYA dissolving using the sock method.
Reduce your pH in increments of .4. Test and reduce again if necessary 30 minutes later until you get to 7.4. Because your TA is high, pH will rise fairly rapidly. As you add Muriatic to lower pH it will also lower your TA. pH rise will slow when your TA gets below 100. When you get there, stop reducing pH to 7.4 and only lower to 7.6/7.8 With TA of 60-80, your pH should be fairly stable around 7.9-8.0, which is just fine. When you get to 60-80, don't reduce pH below 7.8.