No I have no experience with algae scrubbers. Although, years ago when I kept reef tanks I used a refugium with caulerpa to reduce nitrates. It worked quite good. Now I'm more interested in eliminating algae growth while maintaining nutrients for the plants. Kind of the opposite lol.
I have been reading studies on the relationships of macrophytes to algae. It seems the seasons alter the biomass of each at a regular frequency. There are many references to lake matoaka which seems to have an abundance of plant mass and low algae which is what we want. Here
is one article where a researcher is trying to develop a mathematical model of that relationship in greater detail than previous models. I think having a good understanding of that relationship will go a long way at balancing the two. Besides, if anything else, it's just interesting reading.