After reading this thread a little man, let me see if I can help you a little (i use soil only)....
first and foremost, worry more about your water ph and if you have buffer in your soil (dolomite lime etc)......hydro growers have to pay a lot of attention to their ph/ppm cuz their medium has no buffers.....so stop worrying too much about that.....if your water is between 6.2-7, you'll be golden.....onto point2
Spraying with water during the day period on your leaves isn't something I would recommend doing as the extra heat from the light will heat up your leaves even more, trying to get the water to evap off them....no bueno, not to mention your plants breathe thru their leaves...so why would you want to drowned them? only time I've seen people spray when the lights are on is if they're using a product called liquid light (supposed to keep stoma open longer for better growth, buncha bs imho)....never the less, I wouldn't spray them unless you absolutely have to mang...
You can always clone from a flowering plant...the plant doesnt care....the farther into flowering you go however, the longer it takes for roots to form and the higher chance of hermies comes into play.....
As long you alternate between reg water n nutes every other watering, your plant will be just fine......Really though try to get those plants some fresh air on a regular basis, otherwise stress will continue.......
any other questions, feel free to ask....we've all had to start somewhere.....can't tell you how many hrs upon hrs i spent on here when i first started