Always appreciate your guidance Butch. The trick is to have the right nutrient blend that gets to that concentration. Did you go that high with GH Flora nutes and if so, what was the milliliters added per gallon of reservoir of each component when at the 1800 - 2200 ppm level. Oh yeah, since there are different TDS scales commonly used, can you convert your reading to EC to clarify? On my meter, 1800 - 2200 PPM would be 3.60 to 4.40 EC. For other meters, those PPMs could be 2.57 to 3.14 EC. Big difference in concentrations so that is why I avoid using PPM readings in forum posts as I don't want to accidentally give the wrong advise to someone.
I'm hoping that keeping down the pH will make the P and K more available to the plants as that is what I have in higher concentrations in the rez.