Your results look pretty good--except I would bump that chlorine up a little bit. If you look at the Best Guess chlorine chart (link in my sig), the chlorine range for CYA of 30-50 is 3-6 ppm. You are already on the top edge of that CYA scale, and have chlorine at the bare minimum of the scale, so you don't have much wiggle room at all. Besides, if you're still using trichlor, the CYA is going to continue to climb, so you really need to jump up to the next level and start keeping it at 5-10 ppm just to be on the safe side.

It is at this point that folks who don't understand what trichlor does to the water start having algae blooms that they can't control. Your feeder may or may not be able to be turned up to maintain the 5 ppm, but with your CYA that high, you have to be able to maintain it somehow to keep your pool from going green. Now might be a really good time to stop using the tabs and switch to bleach--or, if you want to increase your calcium (I'll let Pooldoc comment on whether or not it's necessary for your pool deck), you could switch to cal-hypo once your trichlor pucks are no longer anywhere in the pool.

Janet