I dont fancy the s700, i just have a feeling that if i was on tour somewhere are they went tits up i'd stand no chance at fixing them. Where as the HYRDs' are fairly simple.
will a YAW one help that much? Or should I just buy one of those little chain catchers?
You can always wait for a second hand S700 brakeset if you don't mind the appearance of the levers.
As for trim - replace front derailleur with YAW?