Why would I want to force overtaking drivers to have to slow down and/or change lanes when it's not necessary? As for what they do...they typically shift left a foot or two in their lane and pass me without incident.

I generally ride 18"-24" right of the line (assuming a wide, debris-free BL). In that position, most overtaking vehicles will move left a bit as they approach me (sometimes with their left wheels over the center stripe). They pass me with an adequate amount of space, and they don't have to slow down or change lanes to do so. In the rare instances where the overtaking driver does not move left (or, when there's oncoming traffic and it wouldn't be safe for them to do so), I move right a foot or two as they get near. Thus, there's always a good amount of space between me and the overtaking traffic.

I don't see how positioning myself in the roadway, with its increased need for vigilance on my part, and increased need for drivers to maneuver to avoid me, does anything to enhance my safety.