Did you use 320 grit sandpaper on the spindle to get the roller bearings to fit? - that's the solution in the CPP literature somewhere.

I had the same issue with the inside bearings on my recent disc brake conversion and a real brief hand sanding with a strip of 320 grit solved the problem pretty quickly.

http://www.classicperform.com/tech_articles/Tapered-Wheel-Bearings/Tapered-Wheel-Bearings.htm