Once the big colas are doing well should you, can you, will it hurt anything, and how much of it, can you strip off of the under growth and will it help channel the energy to the main buds? Take off big fans? how many and from where?
You can lollipop your plants and basically take the bottom 1/3 off and allow more nutrients to reach the colas. There is a huge forum on this technique. I did it to my cfl grow this week for light penetrating reasons also and it is working out nice.