bgray,

based on your previous posts, I think you're making progress but I don't think you're bringing your Cl up high enough.

With a CYA of 90 and a gunite pool, I believe you are perfectly safe raising you Cl into the low 30's. That will ensure that you are reaching breakpoint and freeing up more Cl to do the job.

I agree that the Sun is not your issue with a CYA that high. I do believe organics are consuming the Cl so quickly that you are not reaching breakpoint.