Your're doing the right thing. You'd be happier though if the middle ring was closer in size to the big ring, i.e. 44-34-22. Anytime the middle ring is closer is size to the small ring than the big ring, the middle ring tends to hide in the "shadow" of the big ring, and the result is poor front up-shifting.

Here's the best online gear chart:

http://home.earthlink.net/~mike.sherman/shift.html