@doubleshot00 from what I have read so far, I would make a couple of suggestions.
1. Quit testing so much. I test nitrates and phosphates once a week. Watch for trends to know where and what to do. Don’t know how many fish you have, but if your afraid of tanking your nutrients you may need to feed a little more. (Based on age of tank and others saying your corals are not consuming it.
2. You showed the pics of the emergency overflow but not the main. Your water should remain just above the main return pipe and remain constant. If the water level drops I would assume that it doesn’t return unless your return pipe is well below water level. Pics of that could be good. The water level should change in your sump, not in your tank.
3. Patience, patience and more patience. As everyone says, nothing in this hobby happens overnight. I’m obsessive compulsive and was spending way too much time chasing everything and making changes. Once I quit obsessing and relaxed things got far easier.
I’ve been known to go too many directions at once. Changing this and that to get it “perfect”. The best general advise I have gotten on R2R was to set back and let nature take action.
Best of luck.