Here's another take on all that. Aussies and those who learned to ride or spent most of there riding time in a country which drives on the left hand side of the road, will be more confident in left handers and those who did the same in a country which drives on the right hand side are better in the right handers.
It's a psychological thing. When we do a left hander, our brain says, "Relax dude, there is another 8 feet of tar there if it all turns ugly." On a right your brain says 'Shit man, don;t fuck this up or you'll be in the garden somewhere."
Before I started racing, I was always better on lefts. Now, it doesn't make any difference..................I'm shit at both.

"I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me" Hunter S. Thompson.
There are really only two questions in life. 1.Which way do i go? 2.What is the lap record?