You need to find out the source of that high pH- there's something in the tank, possibly a rock? Did the LFS verify that pH reading, and have you checked the expiration date on the test?
You're infinitely more likely to kill your fish adding pH lowering products instead of doing many, many, many PWC. You're going to end up with your tank water further and further away from your tap water using any other route. IMO tracking down what is leeching into your water (if that reading is accurate) and doing repeated PWC is really the only safe way to get your tank water params back in line with your tap.
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