Necrosis of Leaves + ridiculous flowering time

Not able to post pictures at the moment, but here is the description:

My setup:
230 watt's 10 23 watt CFL's in various positions around the plant. The growbox is roughly 4x4, with one fan inside the box and another fan on top for exhaust.

My soil is happy frog with micorhizae as a base and I threw in some blood/bone meal and earthworm casings (about the same ratio I have been using successfully on all my plants for about a year now). I am not adding other nutrients during flower.

I put my tap-water through a pur filter and let it sit out for a few hours to a day before use. I do not come from an area with strange PH. Nor is my PH off from what I can tell, although it is tougher to tell with soil. The only way I can figure is to water then test the runoff at the bottom with a PH strip to test for irregularity.

Anyways...

I put this plant into the same flower room that has been flowering plants successfully for over 12 months, around June 21st.

It is now August 20th and I just finally started getting the white hairball part of the flowering stage where you know things are starting to occur.... That is like over 60 days of 12/12 at this point.... that is one problem....

The other thing is a very very slow necrosis of the leaves. Throughout the entire flower, I have noticed that the leaf tips turn crispy, but maintain a green color. The leaf slowly crisps from the outside tips and eventually over the course of two weeks on average, will kill that leaf, and after over 50% of it is gone, I just remove it.

The plant is able to produce enough new leaves to keep going, but it is just a non-stop process...

I have not noticed any signs of pests.

Any ideas? Thanks for any replies in advance!

I kinda have the same thing going on to 5 diesels. Do you have any yellowing with it ? Mine started out with tiny brown or rust spots,the tips started drying out like you said and then just continue on its way back,and now they have yellowing in them along with drying out green. I flushed them,Ph'd the water and re feed with lite nutes and some cal-mag but it still seems to be continueing. The lower growth was fine at first but it has progressed down to it. haven't figured it out. 5 weeks in I just wish they would finish so I can get them out of there. The one other strain in there is fine. ?

Sound like the one strain you are having trouble with might be nute sensative.

Hey there guys. I'm thinkin it's your PH. Had the same problem on a few grows and discovered that my ph meter was reading incorrectly. Once I got my new one, I tested the R/O and my ph was way up there.
The Cal-Mag is a great idea. those plants are in dire need of it.
Plus those ph strips are ok for testing straight water, but the second you try and check it w/nute in it, or on the R/O water, there worthless. Check into a Hanna Pen PH meter for just over $100
It will save your plants.
One more thing, are you guys adding an oxygen to the water that u feed the plants with? This will help those beneficial microbes in the soil to do there work...All you need is a fish aquarium pump for around 20 dollars and some 1/4 tubing also sold where the pump is. Wal-Mart....

Hope this helps u guys out.
Later,
Rip