I had horrible problems with rootzone pathogens until I got my RDWC water down below 62. Once I did that, it cleared up and stayed that way, whether I added DM Zone, or H2O2 or nothing at all. Until I did that, nothing else worked. I have to conclude that dropping the water temps down was the decisive step, at least for me.
I dropped my water temps that much on the advice of Jalisco Kid, among others- he said that such temps knock out the pythium rot and give bennies the upper hand.
This squares with other data as well; water holds MORE oxygen in solution as temperature falls, and most undesirable critters in the water are anaerobic, meaning they don't like oxygen- whereas most bennies are aerobic, meaning the more oxygen the better for them! Colder water makes for an easier time oxygenating it and tilts the playing field towards the grower and whatever bennies he's running...
As ever, it's possible to have too much of a good thing; water temps in the mid 50s or lower apparently slow growth.
Finally, I like the blankets you've put on your UC, and I plan to do the same- as much for light proofing as for temperature stability. On the other hand, I do have a small concern here; currently, my water temps fall in the dark period to between 62 and 64 F, and rise to 66 or even 70 F by the end of the light period. I wonder if that temp fluctuation isn't so bad? After all, it drops the temps every night low enough to stop the nasties, and then in the daytime it warms up- which no doubt helps plant metabolism. I wonder if the blankets would just slow my plants' growth?