Update: So.... I waited for the phosphate test (that circupool said I needed) and, my phosphate level was 50ppb - so that is obviously not the issue! The new vs pump arrived, and is the wrong one. I bought 6 gallons of pool bleach (never used liquid before, we shall see what the results are). I am going to slam tonight.
Now (it has been) the pool is crystal clear, no slime or slippyness on the walls. cya is at 80, salt is 3500, and chlorine is none existent still! 2 circupool rj 60's still at max, 2 offline chlorinators ant max, and pucks in the skimmer.
Great to have an update and that at least one thing (phosphates) has been ruled out. Now, the part you may not like as much -- if the pool bleach you got is 10% chlorine (check the label), getting to SLAM FC levels at CYA 80 is going to require 15 gallons, and you're going to need more to keep it at that level until the OCLT test passes (you'll need less and less as the SLAM process works).
Here's what I would suggest doing with the 6 gallons you have, which would be so helpful to you and us in problem solving what's going on:
1) In the evening, turn off all of the SWCGs and chlorinators, take the pucks out of the skimmers.
2) Pour 4 gallons of liquid bleach in. Do this in front of a return with the pump running, slowly so the return stream disperses it.
3) Wait 30 minutes (with pump running), and measure FC -- it should be around 8 ppm if the chlorine and your test are good. Report the results here. Note that for this test you don't need to leave the pump running overnight after this initial time to mix)
4) In the morning (before the sun is on the pool), measure FC again and report the results here. This is the crucial OCLT number and many of us will be reloading over and over to see it!
5) Use the remaining 2 gallons to keep the FC level above 6 ppm as long as you can while you go get more chlorine (unless you pass the OCLT and it's still at 7-8, then and only then let's see what happens to the levels after turning on just the SWCGs).
I know the thread started around the SWCGs, but if pucks in the chlorinators and skimmers aren't raising the FC level either, there's something up that isn't related to the SWCGs.