Set up for an Amal carbie on Ruston PT

I'm thinking a few guys out there would have worked with the carbies on Ruston PTs and Wolseleys.
Any advice on setting up the carbie? I find if I have the float higher it starts easier but keeps flooding. If I put the float lower it seems to be harder to start but doesn't keep flooding. I did read one other Wolseley post about a WD carbie doing similar.
Do you think there is a standard way to set it up or do you just keep fiddling until it cooperates?
Regards Graeme