Bigger tires are the best solution for a fully chipsealed road.

The best (though expensive) tires I know of for comfort are the Schwalbe Marathon Supreme's - they come in sizes from 28c to 40c to 2".

A new bike also might help. ;-) But seriously, I rode around 15 road bike last summer, and the Trek Emonda in 500 level carbon ($2,800 for the cheapest model) would bomb over a pothole without losing stability or having it hurt. It was amazingly impressive, and that's with the stock tires on the bike so I assume 23c.