A good thing to do to help with yellowing leaves next time around is feed it veg fertilizer 2 weeks into bud, and then switch to the bud ferts for the remainder of the grow. This way the plant has enough nitrogen to accomadate the initial stretch that occures when triggered. Another thing that I found helps PH is to mix 2 table spoons of Dolomite Lime in with the soil. This acts as a PH buffer and will almost eliminate PH problems. This will allow your plants to utilize all of the nutrients you give it. And as said above, do lot's of reading. The more you know the better your plants will produce. Good luck!

TGT