This will certainly not apply to everyone, but might help a few.
After months (years?) of nagging from waiting4wind, I finally replaced my harness lines with a set that was two inches longer. Now my arms are fully extended and my weight is hanging out that little bit extra. Can now remain sheeted in when the gusts hit, and I'm definitely travelling quicker, keeping up with guys who used to pass me, and passing those I used to keep up with.