I have ridden about every good road caliper brake out there including most Campagnolo and Shimano models. Brake pads and cable housings can make a difference, but my recommendation is to install a dual-pivot brake on the front. I see no overlap in the performance of dual and single pivot brakes - it is all up to leverage. The dual pivots simply have longer arms and more mechanical advantage.

So the very best of the single pivot brakes (ever), the Dura-Ace 7402, is still inferior to the cheapest dual pivots I've ridden.

BTW: the very best road brake I've tried is the Dura-Ace 7403 (dual pivot).