There's nothing to fix. Was happy before, happy now. Never a problem with braking, just wondering "why not more?"

I don't think Vs would give the performance of discs. We had deep snow in London this year, I was glad to have brakes that still work when wet/icy. Of course, I'm sure Vs would be adequate in that I would get to work reasonably safely, but why settle for just adequte?

Well, the Schmidt hub was £170 (about $280 I think). The disc version was I think £5 cheaper. I'm using the same Campagnolo levers I already had. The fork was no more expensive in disc version. There isn't a big price difference between the BB7 and mid level Shimano V-brakes. Anyway, price isn't really an issue for me. I earn good money, I don't own a car. Saving £50 here and there just isn't that much of a priority.