Thanks Joe, your suggestions are greatly appreciated.
one last question, can i wait a week or so before i take action to reduce this problem? I leave for vacation tomorrow. Should i run my equipment as normal while i am gone?
Also, how often should i engage a sequestering agent? Would that help overall?
Don't beat yourself up over this problem. What has developed in your pool is what we call "crystals" here in the NorthEast. I've had a few customers who were spot on, just like you, with the chemistry, and still crystals formed over the winter. The theories differ as to why this occurs, especially here in the NE. I haven't seen two experts exactly agree on the actual cause of crystal formation. I've spoken personally about the growing issue in plastered pools lately with a prominent member at the NPC (National Plasterers Council). He couldn't even give me an empirical answer as to why this is a growing problem, he was able to give me just his opinions.
Now, back to your issue. Fortunately you have pebble-tec. If you had regular plaster the only choice to smooth out would have been to sand the pool down, ouch. An acid wash will soften the calcium and loosen the scales for sure on your pebble-tec. They will come off easily with a brush after such treatment. Downside: you would have to drain the pool.
If you do not want to go that route, you can try to lower your ph to 7.0-7.2 and keep at those levels for an extended period of time. You will have to brush the walls every day in the meantime until the scales soften up and get completely brushed off. I've seen some level of success with this approach on aggregate finishes.
Lastly, just a suggestion, that has worked so far for my customers after they've experienced the same problem you have. Over the winter, check your water chemistry at least once a month. Try to keep the ph levels low, again 7.0-7.2. You will lessen the chance that any of these calcium formations harden up. If they do form they will still be soft enough to be easily brushed away in one sitting.
Hope this helps.