RE: Carb settings
Its not that unusual. It really depends on the fuel you use and the ambient air temp. If it accelerates smoothly or even with a slight hesitation then it is fine.
The way I set my LSN is I hold the car off of the ground with the engine running and give some throttle, and adjust it so there is a slight hesitation and then the engine speeds up. This will usually make it so the LSN is a little on the rich side. It is better to run slightly rich than lean.
rolland