Tip I use – tighten up using the short end of the allen key, this makes it much harder to overtighten.
Also, I don't see the need to crank on the handlebars, I always am very gentle with everything to do with the handlebar (clamp, levers) and don't find it moves at all.
Do a search for Carbon bars on SDH – there's a recent thread on it with some input from an F1 Materials Technologist – if he says don't use carbon bars (and he does) I wouldn't. It's the wrong applications for the material and simply not worth the 50? gramme saving over a decent ali bar.
SDH = .southerndownhill.com? "You are not allowed to search for posts in this forum. Please login below or register an account with SDH."
What's the guys name? "F1 Materials Technologist", how much does he know about bike handlebars? Sounds like a 14 year old winding people up TBH.