I just installed vessel sinks. They have no overflow. They are slow to drain. Is there a trick? When I jiggle to stopper, air bubbles escape and it drains a little better, but not good. Kohler sez it takes a special drain. Is there something I can do?

This is a common problem that we've seen a lot of lately. Click on: http://www.bathroom-glass-vanities.com/umbrella-drain.html?source=nextag
And see a drain that's made for vessel sinks,(see image). This drain works much better then the other drains of this type because it doesn't have a grid. The umbrella pop-up will allow more air into the drain and dissipates the surface tension that builds up on a grid drain. Good luck, Tom