Shoot - hate to say it but, 10,000 miles after a rebuild is what is going to start separating those rebuilds that are truly "men" from the "boys". At about that mileage, the hard chromium-coated rings should be seated in pretty well if the honing was done right, and blow-by should be at pretty much an all-time low. You shouldn't have any noticeable change on oil level on your dipstick. So, hate to say it but maybe your hone job wasn't done properly? That said, there engines on good sealing stock rings do make some blow-by with some oil vapor in it... it should just be a very small amount though... IE: not enough to make your dipstick level change or cause visible blue oil smoke, but do expect enough to coat your intake with a film of oil though. Did you have your blowby baffle opened up inside the cam cover when you had your motor rebuilt? The guys who are good and really know VW motors will during the standard course of a rebuild, open those up and clean their insides and then re-weld them shut as part of their rebuild service. Guys who rebuild chevy V8s most commonly, etc might not know these sorts of tricks though. The baffle cleaning might help some, and there are other things you can try to reduce oil vapor in the blowby gasses (plastic cam cover, extra crankcase oil vent, installation of an external oil separator, etc) but, I hate to say it but going back to the bigger picture that your engine was recently rebuilt, I think that blue oil smoke out the tailpipe at 10K miles since rebuild is a sign of a larger problem... and I would suspect proper ring seating, and question if the honing was properly done.