So you say you have to cut them in 11 weeks from the 7th? They already look half done. You probably only have 4-5 weeks left anyways, what is the worry for you? Perhaps I read your post wrong, but looks like your plants will be done when you need them to be. Increasig the dark time by an hour or 2 everyday may help speed it up a bit but I don't think it will actually shave off as much flower time as you are asking about. But if you do increase dark time by a couple hours you should do it before the 10th week of flower w/ your arjan's haze. Do it in the 9th week or you could even do it now...if they were mine I'd do the 14/10 swtich now, it will not hurt any of your plants. At week 9 or 10 and after they have had a week or 2 with their new schedule take a sample from mid plant and see if it is where you want it to be, I always sample every plant 2-3 weeks before my goal harvest date. Lets me know,other than overall appearance, if the plant is where I want it to be. Peace and hope this helps and at least touches on the questions you had.