My default position is LH side..primarily to aid cagers in front seeing me in their side view mirror. As for those who stay too far left in a left curve, their problem is what Kathy points out.. that's not where you should be. You 'set up' in the RH side for a left curve (and visa versa) and then arch your way to the inside as you negotiate the curve..for those familiar with track riding, you want your 'entry' outside so that you can 'drive' through the exit on the inside of the curve.. it's the fastest way through. However, that's track but I try to utilize similar concepts on the public roads. Interesting post.