OK, so remaining issues.
1) Vinyl liner old - getting quotes now. Patch seems to be holding. I kept thinking I was losing water, but now I'm not so sure and if I am it is (so far) pretty minimal, especially compared to the huge drop I saw before.
2) Heater not working. My uncle isn't getting back to me (he must be busy) so I may need to see about having an HVAC person look at it.
3) My filter pressure doesn't ever seem to go up. It DOES seem to go down sometimes by quite a bit, and then I backwash and the pressure goes back to normal. Is this a problem? The guy who helped me open my pool (a pool guy but he didn't charge me anything) said the pressure could go down or up, and if it does to backwash, but here all I've ever seen is 25% over normal, not under....
4) Still get some gathering spots of what is either dust/dirt/dead algae on the floor, but since it only happens with the pump on and OCLT seem good, I'm assuming it's dust or dirt. Some of it poofs away when vacuumed and some of it goes in the vacuum pretty well. How do I make sure I don't need to do a SLAM?