Tank and sump turnover rate

[Skimmin]

I was just wondering how many times everyone has for tank and sump turnover rates. I have a 6ft 300 gal. I'm running about 1000 gal per hour through my sump and with powerheads about 13000gph in the display tank which is approx 43 times total turn over. Im just wondering if I should increase the flow to my sump. Or stick with what I'm running. This is the first time I've ever run such a small amount through a sump and the biggest system I've owned. I think the water is not as clear as it could be and I'm just wondering if that could help.