Might want to try flushing them with some distilled or equivelant water and then check PH after that? I had some PH problems early on (was way too high), and a good flush followed by low dose nute (at correct ph) and they rebounded really well, but hat was way early in seedling/veg. I now check ph of what I'm giving them and PH of runoff. Oh yeah, and the Soil you use is going to have a big impact on that too.