TA is good. Do you still add dichlor now and then? That will help lower the pH a little. It also will raise the CYA (stabilizer). Do you happen to know what that number is for your pool?

You can get a small container of "pH Down" or "pH Minus" at the pool store. It's dry acid. The instructions are on the container and are probably given per 5,000 gallons so you'll want to use less. A good rule of thumb is to use 1/2 of any chemical, wait a couple hours, test, adjust.

We have a Sticky for using muriatic acid to lower pH but it involved buying a gallon of acid and you'll never need that much over the life of your pool. The dry acid product from the pool store is more suitable for your situation. It's not expensive, it's easy to use, it stores well across seasons, and for small systems it's more efficient. Just go easy on the amount.