I think the mistake KStar made with knees out cue is he didn’t preference that you needed to make sure you had good ankle and hip mobility.  If other parts of your body are stiff they are going to hold you back in which case you are going to being hanging on tissue — pretty much pulling on something that is not moving which is not good.  The force has to go somewhere, and most likely its going to be your knee if you don’t have the right range of motion.