Honestly, as much as possible, try to only add chlorine and acid. There are some water chemistries that require other work, but they are in the minority. I would advise to let pH creep up (unless your CSI is really negative or pH < 7.0) than adding hardness of any sort to bring it up. Short periods of time with moderately bad CSI's in the grand scheme of things are better than chasing your tail with adding some sort of pH up and then having to adjust it back down, and them back up, and then back down. I did that on my hot tub the first fill and on the second fill I am avoiding that like the plague. Right now for some strange reason the pool is a little negative for the first time ever but again (I think because we aren't in it to aerate it and because of that I adjusted it down just a little too much last time), I just am not doing acid additions until pH drifts back up. Since it has run a little positive for it's entire life so far a couple of weeks negative will balance it out a bit anyway. If you can do that, I suggest that in almost all cases "less is more". Think of the whole water chemistry as a system and don't concentrate on just one or two readings. This is why CSI is so helpful.
I am actually rather amazed that the pool is so darned stable right now. Maybe because it's 55F water temperature? But this is a lot easier than I thought. The hot tub was stable until I did a water change and it will eventually hit equilibrium again. Actually the little 250 gal tank of water is far more picky than 13K gallons is....