OK, so time to report back, and a small correction. One of the things I reported as a slight negative of Aquabright is that my robot didn't scrub the waterline as aggressively. I've realized my robot has been running with a broken impeller for quite some time. I have a new one coming in, and I'm going to guess that this is why it seemed like it was anemic on the scrubbing. So that downside likely was not the aquabright at all.
Second, I assumed the high water stability was due to being winter and being cold. Well with the addition of solar in Feb, I have been keeping my pool at ~80. While this takes a lot more FC, it has not required me to add anything else. My Intelliph is set to 3%, so I'm automatically adding a tiny amount of MA. The 4 gallon tank I filled last fall is still more than half full. I've thought about turning off the IPH to see what would happen, but have not. I don' think it is necessary; I can only attribute this to the Aquabright.
I'm a little confused, because I thought there was no way around having to add MA when using a SWG. Maybe one of our chemists can set me straight on this.
Also, my CYA is a bit low so I'm adding some to hopefully reduce the FC use. I'm running at about 60% for 8 hours, so that seems like a lot of FC from an IC60. I also have been having a record amount of trash blowing or dropping into my pool, so maybe that is also causing excess demand. I think the extra rain this spring made more tree stuff to shed into the pool.
The ever so slight shedding of silica particles [or whatever it is in the AB] seems to have subsided to zero. There is no more evidence of shedding at all.
The only scrubbing I've done is around the steps where the robot can't get, and the spa. There remains some calcium deposits on the spa from before I switched to AB [I had massive calcium deposits in some places]; but I will be cleaning these up, and I don't expect them to return.
Calcium seems to be stable at ~ 220. It turns out my autofill is on my house water, so it is being softened, so I'm not seeing the CH growth I used to see. Supposedly the water softener adds salt, but so far, not enough to increase my salt level enough for my Taylor kit to measure it.
Anyway, it took a while to get here, but talk about an awesome pool! Always crystal TFP clear. If there were not so many leaves, it would be near zero maintenance!
So the Verdict remains AB is awesome.