I always match the clamp to the blade size, as you listed. However it is my experience that I break more blades (usually Pegas mg) with my Hegner than my Excalibur. The clamps are fantastic, but many breaks occur at the jaw of the clamp. I usually eject the 1/8 inch piece in the jaw and reclamp and retension the remaining blade. I also loosen the top screw about a quarter turn to allow the blade assembly more freedom of movement, but breaks still can occur.