I could twist the plane and get it close. But my point is that this is not mentioned anywhere and can be easily overlooked. Going through some of the pics on this thread, you can see some show that condition! I got some cases of over 10 degree angle between dowel and wings and my CG was probably off by as much as 10mm. For a 60mm that I was measuring from the leading edge, 10mm is a lot. Plumb bob at the center works, so I'm not trying to say this method is no good.

I'm at work, so no pics to post right now. But you get the idea, right? It's like the whole thing is twisted and looking from the top or bottom, you see the dowel has an angle relative to the wings, or the dowel is not perpendicular to the fuselage, whichever makes more sense to you. Plane still balancing correctly though, so plum bob at center works. I'm pretty sure the 2 loops method is better in that regards, but I didn't think about that last night ...