i grew this same strain awhile ago and had the same problem with it, didnt get much stretch, there was this long pause as well, it turned out ok but same problem with it, it is the strain i didnt care for it or how it vegged, i let it go but i am pretty sure the rest of the seeds i will not even try with, just was not that impressed with the growing. trust me you did nothing wrong, not a ph issue not stress but it is the strain