Thanks for the info Pete, looks like most of them are running a bit more on either side, the 467 being mildest.. I'm assuming this is for a pretty narrow power band, snowmobiles being mostly cvt, which is right up the vespa alley. It would be interesting to see the transfer timing as well.
I'm planning to start with a few more degrees on the open side the next time I have my engine apart, then a few on the other side see what that does. 140/60 or bigger sounds pretty good :).