Hello Ez trip,
I have just come across your delima and thought I would chime in. I hate to say this but in my opinion, that plant is down for the count. All the flushing in the world is not going to turn it green again. My advise would be to cut your losses an cut it down. Get those brown fan leaves off of it and hang it out to dry.
It also looks to me that your plant was near the end of its flowering cycle anyway. They may have filled out some more but overall, I would say that you have done well with such a small amount of light.
I think that if you continue to try to flush it, you are just going to make things worse because those dead leaves are NOT going to pull any moisture through the plants. If you keep pouring water on it, you are most likely going to get bud rot and your buds will turn just as brown as those leaves and it will be no good. If you get bud rot and mold in them, they will not simply dry out and stay green like they do when you harvest normally. The will turn a completely brown color like a brown paper bag. I call it Zombie Bud and it's worthless.
If you cut it now and remove all of the dead fan leaves and trim it out, you should be able to salvage some smokable bud.
Don't let this get you down. Plant you some more and keep growing, you get better each time...