BTW, Pooks, riders who slow on gentle downhills can be a safety issue on group rides. If someone is sucking your wheel as you come over a crest, they will expect you to speed up. You don't have to be a speed demon, but they will expect you to increase to coasting speed. This sudden slowing is almost as dangerous as riders who fly down a hill and then slam it into their smallest twiddle gear for the uphills, losing all momentum when it isn't expected, and these folks have a tendency to swerve as they shift also. At least in your case, it will be a slow speed accordion.

Good for you for working on your speed. I only mention this because I see you have a Livestrong ride in October.