Great grow, i am very similar as you. I run dyna gro in 3' by 2' trays ebb and flow with a 27 gallon tote, only filled to 18 gallons with no trouble with ppms or ph, I just have to change the res in 11 days instead of 14 days, feeding at 1.1EC in flower, I rarely have to top off. The plants do great. With veg, I feed 4ml protekt and 5 ml gro, about .8 EC with a start of 100ppm tap water. You'll probably recover when your roots get set. Much of the start depends on how strong and large your roots are from clone to transplant. when i'm running behind with clones, i'll use roots excelurator for the first two weeks in veg to catch up on my root zone, its expensive, but it works. Also, its easy to damage roots when transplanting to hydroton. Mag pro is probably not helping, its not needed till flower.