Yes that is right, they are a lot less whippy with the right overlap. It's also why some companies were stating different lenghts for a pole saying it was longer than it actually should be.
It's a good idea for anyone who has recently got an X-tel to unscrew the clamp and check the overlap lenght on the first couple of sections, there is a strip of nylon tape stopping the section coming out, it should be 250mm. If it's not unwind it and move it up, job done.
thanks foxman, thats just what i was thinking