The wobble method works from what I've read here, I haven't tried it.

In my particular situation, what has worked is using a daylight visible taillight - IMO only the DesignShine DS500 and some of the Dinotte models qualify - but both are in the $200 range for a taillight.

The other thing is to take the lane when necessary. I actually ride pretty far right most of the time, but there are times when I am mid-lane. It's highly situationally dependent though and I am not going to try to tell someone else when or how to do that.