Continue with the sustained high cl levels. Run the pump 24/7 and backwash any time the filter pressure rises 5-10 psi over clean filter pressure. Continue working to lower pH. Return the Phos-Free and get your money back. You are right. You don't need it. Phosphate removers are one of the latest "must-have" products according to pool stores. In reality, they are the latest "make some money on unsuspecting customers" product.

You need a kit! Need a kit! So you don't have to rely on the pool store. Plus, your numbers will be much more accurate than what they do. Do yourself a favor and get a Taylor K-2006 or 2006C. See the link in my signature below.

You're making good progress. Keep up the fight and you're gonna win!