Just thought I'd post a follow up with my testing results. I feel pretty confident in how my testing is going and how much of [insert chemical here] effects various water levels. The only thing I'm not sure of is how much (if any) baking soda should I be adding, or is it something that you get right once and it's then mostly OK? Here's a little spreadsheet I've been using to track how things are going, along with some notes about weather conditions. We didn't use the pool much last week due to the "polar vortex" that dropped our nighttime lows down in the 40's.

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While I'm posting this, I thought I'd ask about how much effect temperature has on the chemicals and levels in a pool? From what (I think) I remember about college chemistry, higher temperatures tend to make reactions happen faster, but I'm not sure if +/- 5 degrees is enough to drastically change anything?