First of all, your buddy should have known that you don't clone plants when they are in their flowering stage. The clones that you got from him would get stressed out if you tried to put them into a vegetative stage, and might resist you. But from the sounds of it your issues are with your flowering room, and not with your mother plants, or the clones that he gave you.
Your temps are too high, in my opinion. Not that they are out of control, however. As odd as it may sound, I have had successful grows when I was unable to get my cab under 95 degrees in the peak of summer. But ideally, you should have it around 75.
If you are new to growing, new to mj, new to cloning, new to building cabs (at least these ones, I know of your previous experience), and new to hydroponics, it would probably be best not to try and master all of these at once. Fuck the hydro for now. Fuck cloning for now. Worry about your cab and your plants, and actually being able to flower a plant. Then move on from there.
My assumption would be that your problem is somewhere in the process above. If you have a mother plant that is doing alright under CFLs, then you clone her, put it in hydro, and put it into your flowering chamber and they start to die, my guess is that's where the problem is. I can't exactly say what it is, because I don't know all of the variables, but my suggestion would be to place your mother in the flowering chamber, and see if she does all right. If She starts to wither, take her out and put her back under the CFLs. If she can't stand it, then it's the room, if she seems all right with it, then it's your cloning process.
I hope this helped.