From that data, I would expect worse algae than what I see in the photos, so you are lucky. But there is an imbalance, hence the algae.
In the presence of sufficient light (which is certainly present here) plants will only photosynthesize full out if all 17 nutrients are available. While some of these naturally occur in the tap water (the hard minerals replenished at a water change) and some come from fish foods (organic waste in the substrate broken down by bacteria) it is likely that something is in short supply. Algae, esp brush algae, is more adaptable than plants at finding what it needs.
The Flourish tabs supposedly last 2-3 months; I replace mine every 2 months, and I use them next to the largest swords and the tiger lotus lilies. I also use a liquid fertilizer every week, Flourish Comprehensive Supplement, which contains all nutrients in proportion to the needs of the plants. Many think that reducing fertilizer will stop algae, but actually the opposite is true, because this denies plants the necessary nutrients so algae takes advantage.
My suggestion would be to dose Flourish Comp once a week; the day following the water change is best as water conditioners that detoxify heavy metals will negate some of the mineral nutrients in Flourish. Light is probably fine. CO2 I leave to you; I never add this, I rely on natural CO2 from the breakdown of organics and then balance my light and other nutrients accordingly.
Once the balance is restored, the brush algae should not increase. What is there will remain unless you manually remove it. I leave it alone on wood and rock, but when it appears on plant leaves I know the balance is out and fix that.
Hope this helps.