I think what it destroy pH is to water with nutrients sometimes...and plain water other time.
You should check your runoff EVERY watering. That tell you how much your plant needs.
If you water with plain water and nutrients somtimes...its not the same ph. You should water evertimes with nutrients but some more ans sometimes less and ALWAYS WITH A RUNOFF to remove the build in salt up down.
Thanks Exo, I do believe I mentioned this ins't my first organic soil grow... I have successfully completed many organic soil grows with bottle organic nutes, AND grows using guano & kelp teas as well. I have never pH'ed the water for these previous grows and they produced the best buds I've grown. This is the first grow with soil ammeded with dry ferts following the 3LB's recipe. The soil had plenty of time to cook (6-8 weeks) and I know it was mixed perfectly with the correct measurement of each ingredient. I have more clones of a different strain rooting at the moment, so I will put these new clones into a lighter mix to see if maybe the soil is too hot for fresh clones. The strain I'm growing (headband) is an extremely heavy feeder so I didn't think it be a problem for them. This headband is VERY finicky and will show signs of veriagation if not dialed in just right and I am seeing some of that now. This is why I want get this issue nipped in the butt asap.