Upland or waterfowl? Sorry, don't know much about labs or flushing dogs. I do know of a trainer in Waco, TX, Keith Hickem but I think he's still in ND training a summer camp with Gleber. Contact him at
http://bootleatherllew.com/index.html
He's a pretty easy going guy, and could probably steer you a good lab trainer and give you some advice.
I know jonesy & doc here also trains labs. Bothfrequent these boards.