I use to have this problem till i figured out what it was... The problem is I kept on trying to fix shit that wasnt broke in the first place lol... So I went back to the original game plan and took out a few things I felt did more harm then good and went for what I know and guess what... Problem no more!
I use r/o water and hg and a couple other products...
Problem 1- I was feeding them too hard from the jump. I knocked my dosage rate back to the clone dose (between 2-2.5ml of a&b per gal) for the whole veg phase that helped out like crazy they flew again after this...
Problem 2- I use to listen to people on the fourm and even the hg reps but I found out that what works for me is 5-7ml gal of
calmag+ from
botanicare... Yes I said 5-7ml depending on what phase of the grow your on obviously 7ml would be about weeks 3-5 of flower.
Problem 3- I used some products that were on the thick side like roots excel and
amino treatment... Truth is the system does way better and runs way cleaner without the 2 so I stopped using them and that helped.
Problem 4- Dropping them into the water from a non chiller system to a chiller cooled uc tends to shock them I think... I learned to keep my chillers off for the first day or so of dropping the plants till they get use to the uc.
Problem 5- I wasnt using epsom salt for the longest... Epsom at 1 gram per gal on top of the cal mag completed the puzzle that shit works...
Problem 6- I was also using exel lg which is now organicide if you read about it you will see what its about... I was going full strength on that i cut it down to half for the veg period... That helped also.
The combination of these things has completely took out any stalling that was taking place... I get brand new growth the next day after transplant I been rolling 2 uc's like this for about a good year, same result every time. Thats my two cents.