As for the touch up paint, my TriX is a nice gloss black. So I just go to an auto parts store, and voila, LOTS of paint to choose from!

I haven't had any high speed wobble going downhill, but I was only going 32 mph (ha ha). Exactly how fast were you going?

One last thing, canti brakes on the TriX aren't going to be as strong as sidepulls...