I have encountered the same problem but came up with a different solution. Instead of tapering the hole I sand a half circle into each side of the surface totally exposing the knuckle of the hinge. This makes gluing quite simple, because at no point will the knuckle encounter glue, and the hinge will seat all the way into the surface.

Here is a photo of the hinges in a flat surface. It works with a beveled surface too.

My tool of choice is a hand held dremel sanding drum... It is just a tiny bit wider than the hinge. Only takes a few minutes to compete a surface just rubbing the bit acros the hinge pocket.

SunDevilPilot