I bought a set of Bartolini 59J pickups for my Lull a few days ago, but it appears that I'm having some trouble installing them. The Lull was originally set up in a Vol/Vol configuration, but I decided to replace the bridge volume pot with a blend control and use the neck volume as a master volume. I have everything wired up according to the diagram here. The pickups appear to be working fine when solo'd. However, as I move the blend control from either extreme (Neck solo or Bridge solo) the volume drops significantly until I get no output in the center position. Does anyone have any ideas what the problem could be?