Losing 1ppm if it was really sunny wouldn't be unusual. You're gonna lose chlorine and that is fine. CYA helps protect it but losing it during the day is to be expected. Plus, as the chlorine does its job of sanitizing the water, it is also depleted.

If our CYA is 45ish, I'd leave it there for now. If you find that you can't keep chlorine in the pool, you can always add more. Don't bother having anyone else test it for you. YOU will do a better job than any pool store. As far as having to shock harder --- you use more chlorine at a time but don't have to add it as often so it balances out. And, high chlorine with high CYA is not any harder on swimsuits than low chlorine and low CYA. It is the same.