No I don't know enough about that to try. Afraid I would mess up and kill it
Grow some balls, my man! Your plants are the bitches, you need to be the master
I have never seen a plant get killed from topping it, if it was established. If it's at five nodes, and you topped to two, no harm will be done! Quite the contrary, really. You will get a nice bushy girl, and a good cutting to turn into a clone. Your grow is looking good, but don't be afraid to push them a bit. They like to be told what to do lol. Also, you can always just try something on one of the plants, or a few, and see if any ill effects occur.
Good luck, dude!