Complete the SLAM, with all criteria met. You are likely about done, just make sure.
When done focus on pH first, and TA last. You can find out how to work it down reading the article in pool school, but don't be distracted with it.
A loss of 2, and as much as 4 PPM during peak summer months should be expected. Your milage will vary with use, and cloudy days, but this is pretty normal, even with proper cya levels.