With my KCNC Skewers I found it easier to setup up by closing the lever somewhat loose and then giving it half a turn while closed to snug it up. I have never had a problem doing this. They fit tight with out any squeaks and it doesn't seem to be abrasive on the dropouts. I do inspect the dropouts each time I remove a wheel to make sure I'm not eating away any carbon.
This. I have no problem with my KCNC skewers. I actually find them really quick to take wheels on and off.
-Tighten until lever is able to close with a bit of force but not a lot
-Twist ~90 degrees CW to desired resting position
Just do the reverse process when taking them off: Twist ~90 degrees CCW of a turn and then release the lever.
Sorry, not so perfect in english and could not figure it out what do you mean. I just went back today to Mavic skewers as my KCNC started to give a play to the front wheel. I have to tighten them really hard (according to me too hard) to make them work and keep wheel in place. Do I do something wrong? Could be overused? Do they need some clean up?