Generally speaking pH is not concern for most reefers, although many feel it is. A range of 7.8-8.3 is not uncommon. That being said - the key as you mentioned is reducing the fluctuation day-night as much as possible.
Easiest thing you can do as mentioned above is add some macro algae in a refugium and have it on a reverse daylight schedule (say from midnight to 9am) to help control the pH swing. Do not run the refugium light 24/7.
I tried dripping kalc, and found that is was tough to keep my dKH where I wanted it, not to say it is not effective for some. Try some macro in the fuge and see what your fluctuation is. Cheers.
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