Update
Corals - seem to be doing better. Still lots of strings off the german blue in a number of places, but it is definitely growing. Red monti is still pink. In fact, all montis don't seem to be doing much of anything. Mushroom is getting bigger. Bird of paradise is very fluffy. Forest fire seems to be growing a bit (some upward pointing nubs appeared). The tricolor is definitely growing, over the last 2 weeks a new row of polyps and coloration has shown up on the tall stalk. Rhodactis is bigger.
Stenner - I've now run a few 5 gallon exchange cycles and it is off by a lot on the amount of water removed vs. returned. It probably adds close to a gallon more than it removes (or removes a gallon less) - my sump level goes up almost 1/2" with a 5 gallon exchange. I need to sort that out. I have probably 50 feet of line from the tank to the Stenner and then another 10 to the pickup and 25 to the waste. Don't think there are any kinks in the lines. I may need to just pull the pump and test it with very short equal length lines for flow from each head and see where the problem is. Withholding judgement until I find out if it is a plumbing or pump issue. Right now it just keeps the ATO from turning on for a while after a water exchange, but my concern is over time increasing the salt concentration of the tank as I am effectively adding saltwater to make up for evaporation.
Added a Neptune DOS so I can try and stabilize my Alkalinity and Calcium. My Alkalinity has always been constantly dropping, but over the last week, the Ca has started to drop as well. Hope to get that dialed in and stable while also raising my alkalinity up a bit (generally been 7.5-8.0 with my manual dosing). pH is still on the low side (been tracking 7.80-7.87 over the last week). I'll be raising the Alkalinity, which should have a positive effect on increasing pH, but I may desire a touch more. We'll see. I am currently not running the CO2 scrubber, as that seems like a really expensive way to bump the pH about 0.2 points ($1/day for scrubber material).