That all ties together nicely with your test results.
Generally, with a CYA of 45, a range of 4-7ppm is perfectly adequate and it sounds like that's the range you're already in.
Your chlorine consumption is perfectly normal as well.
If you demanded to adjust something in your pool, you could drop the Alk down to around 100........if it were my pool, I think I would spend the rest of the Summer swimming and enjoying the rewards of the nice work you've done on your pool water. :lol: :lol: