I'm using the new HD formula in 5 gal fabric pots with promix BX with about 20% chunky perlite added and had the same problems in veg when trying to stay at 1.0-1.4 ec. Using mostly RO water collected from ac n dehumdifiers with 50 ppm tap when needed and getting cal mag symptoms with purple stems. My last feed was at 2.1ec 6.2 ph using HD with +life and some tea mix and it helped some but will take some time to correct in my medium. Growing sour diesel witch are nute hogs and new to hydroponics research products.