I have a Mk2 bike, the brakes on it, single pivot, were made by CLB of France.
After fitting a set of Kool Stop 'Continental' I have no braking issues,
they Stop me fine.

I don't know what the braking you consider (in) adequate for your
(pro racing like?) speeds,

Given: the dual pivot brakes type, have been adopted
by the race Bike Component Manufacturers
So, would be a significant change, for the better, It would seem.