I use API's pH test kit and haven't used Seneye or Pinpoint. For pH what I look for are long term trends and while I typically test weekly along with alkalinity if it's off from the previous week I'm not going to worry about it, there's too many things including weather that can influence weather day to day or week to week. I'm sure you've seen this elsewhere but the four tests every newbie should run weekly to get a better understanding of how their system works are pH, alkalinity, calcium and magnesium, of these I consider alkalinity the most important.
Since you're new these videos you might find informative:
"Coral Reefs in the Microbial Seas"
https://www.youtube.com/watch?v=-R2BMEfQGjU
Changing Seas - Mysterious Microbes
https://www.youtube.com/watch?v=c7hsp0dENEA
Nitrogen cycling in hte coral holobiont
https://youtu.be/DWItFGRQJL4
BActeria and Sponges
https://www.youtube.com/watch?v=-oLDclO7UcM
Maintenance of Coral Reef Health (refferences at the end)
https://youtu.be/dGIPveFJ_0Q
Optical Feedback Loop in Colorful Coral Bleaching
https://youtu.be/oadKezUYkJE
Richard Ross What's up with phosphate"
https://youtu.be/ZRIKW-9d2xI