I keep my CYA at 90-100 for that exact reason. Since my climate is very similar to yours, you might try bumping your CYA up just a little to see if you slow your chlorine loss at all. When I keep my CYA at 40-50 ppm, I lose 4-6 ppm of chlorine daily. With it at 90-100, my loss slows to an average of 2-3 ppm. My pool is in full sun from 8 AM until around 7 pm during the summer. Air temps lately are 98-102, pool temp yesterday afternoon was 96 degrees. I dose with bleach every 2-3 days.