Wow, I'm in the exact same situation with TA around 200 and CH at 600. I've let it get away from me but I had to deal with it because my Aquarite Turbocell was corroded.

This has resulted in me adding way too much salt. I'm going to start by draining/refilling a % of the pool water, then get my other numbers in order.

I'm anxious to see what results you get Mike.

Mike