It's almost pointless to try to figure out. It ends up an argument. Factor in contact time with media and all of a sudden if you're running 30 times turnover with very quick contact time you may be able to achieve the same result with 8X turnover and longer contact time with the bio.
Seems the norm these days with rays is running a bio reactor which usually runs off a seperate slower flowing loop that splits off from the sump and drains back into it. If you contact the people that develop or work with this type of media they tell you longer contact time (slower flowrate) is ideal for this type of media.
It's easy to replace the water movement with korilia type pumps that do several thousand gallons an hour on like 30 watts as opposed to giant pumps that devour amps instead of watts.
Bottom line- do what floats your boat. Study, build, and improve if you think it's not working. Every situations different and it's hard to argue points about things most of us don't truley understand enough to argue about anyways.
Electricity isn't going to get cheaper. I'd keep that in mind when looking at turnover rates. If you can achieve the same result in the end without having a $400 a month electric bill then that's the important thing.
I seriously probobly quadrupled the GPH being ran at my place for less money per month by simple replacing pumps. When shopping for them the first thing you should look at is the electricity label vs flow ratings then the pricetag cause if not paying attention it's easy to get burnt by cheap pumps.
