If your corals are doing well and you don't seem to have excessive nutrient issues, I wouldn't mess with your pH.
While measuring pH can be helpful (e.g., you discover it's 7.5 or 8.8 after a water change) in alerting you that you need to take action, I wouldn't mess with it. 8.0 is totally fine. I saw a TOTM that was absolutely amazing and I recall it's pH was something like 7.8 - 8.0, before and after the light cycle.
dkH of 10 is probably ok, but I prefer to keep it around 7.5 - 8'ish and no higher. I noticed my SPS do not do well when I crank it up....although my pH does increase more overall.