Don't cut off any branches that far into flowering. You really shouldn't do any pruning past the end of week 2. You could end up stressing your plant and stunting growth. A good rule of thumb I use when pruning is to never prune more than 1/3 of your plant off in one session to avoid stress and stunting. I'm not sure if CFL's for side lighting would help. I've only grown with 600 and 1K watts before. It definitely wouldn't hurt anything though. Adding Bontanicare Sweet or Advanced Nutrients Carbo Load will add some bulk to your plants.
Flipping the lights is a term meaning to change from 24/0 or 18/6 (veg) to 12/12 flower.
I use other nutrients than big bloom and tiger so I can't say for sure. Generally what I do is start out at 1/4 strength of the recommended dosage followed by 1/2 strength on the next feeding and if you see no signs of burning then go to the full recommended dosage. Once you know what the plant can handle you can apply those notes to your next grow if you are growing the same strain. Regardless, it's still good anyway to step up the strength of your flowering additives all the time rather than throwing them the full dose right off the bat.
Just keep an eye on the tips your leaves and if you start to see brown or yellowing then you should give your plants a flush til runoff with plain water or a leaching agent like Final Phase or Flora Kleen. It all depends on the strain whether your plants can or can't take it. I had OG Kush and Granddaddy Purple on my last round and started my Purple Maxx Doses with 1/2 tsp per gallon and then stepped up to 1 tsp per gallon and my plants were fine. This round I did exactly the same. My Space Queen plants were fine but my Sour Grapes got a little nute burn. So, it all depends on the strain. Every one is different. Good luck!
I'll second that. Skunks tend to be Sativa dominant. In addition it looks like you're lacking substantial light, I suggest mylar on the walls surrounding the plant.
