Wow... you have a jungle in there! I would do some defoliation but slowly and carefully. You want to get not only light but a lot of good airflow going. Choose fan leaves that are blocking another bud site from getting light and, using a sharp knife or pair of scissors that have been sanitized, clip them off... but don't do too much at one time - there's always tomorrow or the next day to do a bit more and you don't want to stress your plants too much. If they act as if they didn't even notice what you did, you can trim a little more tomorrow or the next day until you get it to where you want it.
Good luck! Looks like a magnificent grow!