I maintained a similar routine with a tank a few years back...
Every 3rd day i changed out 10% for over 6 months. I never did notice much of a difference. The nutrient levels did seem to reduce initialy, but i found that the skimmer would hardly produce any skimate. I suspect this was down to the dilution of waste although the skimmers weren't the best back then. Believe it or not, I did notice the nutrient levels actually increase over the long run! I put that down to the fact that i was using tap water
and not R/O....
I think i was putting much more of the bad stuff back in
Ended up being a Chore.
Would be interested to know how you get on.....
Simon..