How long ago did you you start using Shooting Powder, and have you been giving them Ca/Mg? Honestly I would probably add Top Booster right now, and wait a few more days for shooting powder, but keep doing what you are doing, do not turn back. Trying to go a step backwards after it's too late is what ruined my first Sour Kush grow, which was a really easy strain.
Anyways, the Shooting Powder is amazingly powerful stuff, and does good things, it can be a little scary at first. What it does, is that it signals the end of life for the plant, it kills it. Why this is good is that it takes like 3-4 weeks after giving it shooting powder for it to start going downhill, until then it gets fatter, and fatter, and fatter. When the end of life signal is given, the plant produces more weight as a last desperate attempt to attract pollen. So this process takes a lot out of your plants, as they suck up all the goodness in the fan leaves into the buds. You will notice the leaves will burn at the tips, the ridges will turn upwards on the leaves, and some will turn brown and blotchy with yellow, and fall off. It's all natural, it's all good stuff. If you feel like this is happening to fast, run a little plain water through each plant, maybe the shooting powder burned it. They look like they might be a little over fertilized, So I would give them 1/2 liter to a full liter each of water, you don't have to listen to me though, they will probably be just fine.
Finally, if you have not been adding a cal/mag supplement you need to in order to get a healthy full crop. Believe me when I say it increases your yield by A LOT. At about 4 weeks into flower is when they really need it. Just follow the regular directions, you don't appear to have any major deficiencies. But all in all your first crop looks a lot better than my first by a mile. Can you explain that plasma light to me? I've read very little about them but am very interested, as I am a plasma TV salesman. I want to know all the Techy stuff on how it works, the spectrum that one produces, and how many initial lumens, wattage as well!
And finally, my advice to you, since I believe Thunder Fuck is a 8-9 week flower, and you started shooting powder a little early, do a 10+ day flush. I really have my flushing technique down. First 3 days, lots and lots and lots of water with Cell Splitter (not available here in the US [I'm just special like that], you can use Liquid Karma) and Ca/Mg (doesn't matter who makes it, unless it's General Organics, don't use their with synthetic fertilizers), pH is raised from 5.8/5.9 to 6.0 . Next 3 days is just lots of water with my carbohydrate (usually Sugar Daddy or Sweet Raw) with a weak application of Ca/Mg at a pH of 6.0-6.2, I then do a day or two of Clearex and Water (6.0 -6.3pH if it is too hard to adjust ph at this low PPM rate, don't do it, it's not worth throwing away your solution multiple times), and then a full 4-8 days of nothing but water, I used to pH the plain water, but it really doesn't matter anymore, I try and raise my pH to 6.3 by harvest so it works with me this way. I just try to raise it slowly so I don't stress the plant, but it allows it to take up all the important flowering nutrients. After cutting all nutrients, you should have run at least twice as much water, as hydroton in your pots. Example: if you have 3 gallon pots, you are going to run 9 gallons of water through each one. you can do this all at once, or over the last week. I would try and get it in 2 days, you want at least 3 days for your plant to take up that water and replace that green flavor with sugar. So you can just leave your plants alone in the last few days and blow some smoke on them. If you are cropping early, a 24 hour dark period before crop will really really help mature your trichomes, I don't know if it makes it any frostier, but it's more mature without a doubt.
Once again, congrats on your crop, take this time now to prepare a room for hanging and drying. It needs to have air circulation, with no direct wind on the buds, it needs to be dark with no UV light, 70 degrees and 45% humidity, it's best to hang your buds upside down still on the stem, after trimming them. If you need more advice on it, I'll make sure to fill you in, it's a very important step, just like everything else.