Look into the diurnal pH fluctuations of ocean water. I know we all like to see nice, pretty, even numbers on trends, but pH isn't something you should be chasing so hard(unless it's averaging below 8, which yours is not). I just read a study on acropora growth for you. The groups were pH 7.8, 8.0, 8.2, and a fluctuating group that ranged from 7.8-8.2 on a daily cycle(this group averages at 8.0, but remember that it fluctuates). 7.8 was the big loser. 8.0 was second to last. The 8.2 and the fluctuating group were statistically the same, even though the fluctuating group averages .2 pH lower. These 2 groups grew 34% faster than the 8.0 group.
Your tank looks like it averages somewhere around 8.35, which is just fine. As long as you have photosynthesis occurring in your tank, there will be natural fluctuations that aren't worth trying to stop. During the day, algae and zoox absorb CO2, which raises the pH. At night, they release CO2, which lowers your pH. This cycle occurs in every natural reef system in the world. These animals are adapted to this cycle and while the jury is still out on exactly how pH swings affect growth, research suggests that these swings are actually beneficial to their growth.
If you're just looking to experiment with your tank for fun, by all means go ahead. It probably won't be majorly destructive. But ultimately, it'll amount to added costs and headaches of extra equipment+maintenance, and still probably not seeing a perfectly even trend without precise dosing and a pH controller on a PID loop(not sure what the apex systems are capable of, but I do use similar tech at my water job).