I don't think I'd thin that girl out - looks like you're starting to flower already, and the size of the plant vs. this stage in the game (unless you're having spider mite problems - which is a good reason to thin some of the inside shoots) makes me think you'd lose harvest weight in the end. As long as you've got enough light you might wind up with bigger buds, but still possibly less overall. Good growing!
kush plant??? I've had a kush plant look like that once. it wasn't too bad but it wasn't good either. a bucket for a pot??? hope it drains well. drill some holes through the bottom if you have not done so