I was checking out that thread you posted and going to give it a read when I get a chance later this afternoon.One thing as well @LRT your water may have higher levels of organic carbon, which aren't easily removed by membranes. High levels of organic carbon through your system will lead to fouling of the system, and even undetectable levels of organic carbon could be fueling your growth.
I may shoot you a message. Tbh I'm not really sure what im looking at when I look at my Mesa az water report. Or what would be the best way to configure my rodi based on that. I have noticed the chlorine blocks made I difference. But I don't think im seeing chloramine or chlorine being used. Been awhile since ive looked at it though. Maybe it's the .1 blocks making the difference?