Couple more things...
Do I understand correctly that the belief of the BBB method is that you only need to shock if you are having or starting an algae or known pathogen problem? I'm referring to the PS statement of shocking weekly?

Also, RE: CYA testing I've tested using the add 7oz water then add 7oz regent shake like hell then drop until you can't see the black dot enough to go through a little over 2 bottles (.75oz) of regent. Every single time I don't get half way to the 100 mark before I can't see the dot. basically the fluid drops out almost white. The first couple of times I thought for sure I was doing something wrong but in reading I haven't seen anything to have me do any different and my tests have been consistent.

For background this is a pool with a power cover and the Pentair 300 3" tab chlorinator adn when I moved in the valve on the Pentair was set at the max setting. I wouldn't be surprised if the majority of the water is years old and the prior owners were struggling to keep the water clear. Based on what I'm seeing on here Regarding the tabs I'm not real surprised...now. (although I was the first few times).

Brian