Great advice from everyone but just another thought is check your gearing.
I don't have as many issues staying with the men descending on corners b/c I weigh so much less (= slower speeds) I don't have to hit the brakes as hard or as often. As soon as the road straightens out the clydesdales win EVERY time. I got soo sick of it I started to do my homework and now I have three different cassettes on three different wheelsets.
To show the difference a cassette can make (I am assuming you have a compact).
50/34 -12/27 in the 50-12 position @ 80 rpm you will max @ 26.1 mph
50/34 -11/25 in the 50-11 position @ 80 rpm you will max @ 28.4 mph
This is math for flat terrain but the principal applies to descending hills as well. So the 11/25 ensures I usually don't run out of gears. Note I only weigh 125lbs so I pedal ALOT!!!
So a good climber may not be using their 34/27 or "granny gear" so I would swap the 12/27 for an 11/25 and gain the top speed descending gear.
The point is to understand what gears you have and which ones you actually use or don't use.