OK -

I had it up (10+) all night. (Filter 24/7)

No change at all, no better no worse. One thing I find interesting is that I have a fountain on the pool return. The splashing of the fountain appears to create some bubbles on top of the water that linger for longer then I would expectected

I've just changed the cartridge filter to rule out a dirty cartridge.

TA-80 (a little low)
PH - 7.0 - 7.2