Yeah I suppose your right about the turnover rate, I did just read a bunch of people's opinions on that. I wonder if there are any real studies with real evidence as to what a proper turnover rate should be.
And thanks for all the advice on the skimmer, I never tried closing the air valves, they've always been fully open. Do you suggest I close them a bit? I like your technique on cleaning the air intake of the pumps, I think I'll give that a shot when I get home.
For sure close them to 2:00 o'clock and adjust from there! Make sure air intake is clean and it's going to now skim like a beast!