Issues with a Flowering Mom

So my friend had a Lemon-G (Lemon Skunk x G13) mom that he was going to toss because he had just ravaged it for clones and had an alternate mom for that strain. I had just started my medical perpetual harvest grow, which allows me to grow 6 plants with a max of 3 flowering at any one time. This lets me space each plant in their life cycle so that about every three weeks (depending on the strains' flowering time) I can harvest a new strain. At the time I had three plants vegging and was about two weeks away from moving the oldest into flowering. Since I was going to have the 1000w HPS running anyway, I thought I may as well veg my friends mom along with the oldest plant of mine so I could move them into the flower room at the same time and get more buds for my initial harvest. This extra veg time allowed the mom to bush back out. Both plants were about the same size when moved to the flowering room. I knew the growth and budding of the Lemon-G would be odd since it is about 8 months old and has like 7 tops because it had been pruned for clones. The plant is in FoxFarm Ocean Forest with two inches of coco at the top and bottom of the number 7 pot (not sure how many gallons it is, prob around 5 gallons). I fed it FoxFarm Grow Big when it was vegging and am now feeding it about 1400 ppm 2/1 Tiger/Big Bloom, also by FoxFarm. I water it with filtered well water (about 50ppm) that has been bubbled for 24 hours every other watering. It has been on 12/12 with a 1000w HPS for 37 days now.

Now that you have a little info, on to my concern. I feel this plant has a PH issue because the leaves are starting to turn brown and break off toward the top,most prominent buds. When I water it with PH neutral 7.0 water, the run off is low, about 5.4. The non-digital Soil PH meter I have says that the soil is about 6.7. I have added dolomite lime to the top layer of soil, but because their are so many roots I just had to sprinkle it. I have also tried adding to that plant's waterings to try and correct the PH, but it has not raised the runoff water PH. I am afraid the leaves will continue to fall off to the point where the plant will not get enough light to grow bigger buds. It is strange that it has gone this long without issues or a change in what I feed it. Another issue I am having is that the plant looks like it is trying to finish. The hairs are now 50/50 orange/white and the trichs are looking more milky than clear. It is only at 35 days flowering, so this is not making sense to me. Do you think that the plant is trying to finish because of the stress of the ph? or maybe because it is already so old? I will include photos in my next post. Thanks in advance and let me know if you need any more info on my setup.

to me it looks as if you have a nute Lockout problem. This can happen with the ph problems you are having. Looks like a mag def. View attachment 1481073. Have you tried a flush with something like Florakleen?

Thank you. I have not used a produce to flush this plant, but I will get one as soon as I can. It does look like a calcium or magnesium deficiency. I thought that, but also thought the dolomite lime would fix it. It wouldn't though, if those nutes are locked out because of the PH. Great idea. I guess a product flusher should be the first the first step to most lockout problems. Thanks again.

as greenjacketdude said, flush...i had this exact same prob on the last soil run i ran before i switched to hydro....i agree, that i looks like a mag def....this was before i used cal/mag....im pretty sure u can use epson salt to deal with magnesium deficiency....hope this helps....good luck....ganja heres some pics of what mine looked like.