See, this means there's a fundimental difference in technique. In boxing, thrusting forward doesn't cause your heel to be lifted off the ground, you're actively pushing up with your ankle. The ankle actually generates a large portion of the power that goes into the cross, like when you jump rope. No matter how flexible you are, you *want* your heel to leave the ground, because pushing up and forward with your ankle actively throws your body into your opponent. It's also partially responsible for the lean I talked about. So basically, the only part you disagree with me about is chambering punches, to which I would say, years of chambering my punches in katas/forms/etc. has made it hard for me to fight with a high guard like in boxnig, and even now, I leave my head open a lot. I've seen this in the two other people I know who have switched from Kuk Sool to MMA as well. It really feels like I'm keeping my hands up, and looks kind of like it, too, but there really is a difference in the way boxers and karateka hold their guards and prepare for punches - even if it's not the overtly obvious chambering of a kata, in most karate people, there seems to be a habitual slight lowering and pulling back of the guard before punching, which doesn't really add any power, and can be quite dangerous.