Just had a fiddle with the calculator myself and it appears the needle has a big affect on the size of the main jet needed and brings them down to smaller than one might think. That said, if the plugs are showing lean, you need to go bigger. Unless you put it on a dyno, it's all about guess-work so try to find a friendly jet supplier who'll let you swap them around and have a play with different (bigger) jets.
After warming the engine up fully, wind the loud-handle to the stop in 2nd gear. It should reach the rev-limiter pretty sharpish. If it doesn't make it, if power tails off above a certain revs or if it feels like it's gonna blow, you're running lean.
On my bike, with long TORS and the rest of it stock (inc snorkel), the power used to tail off drastically at 6k revs (using the above method) and I only once hit the rev-limiter, and that was with trying. At those revs, the bike sounded like it wanted to blow up. I threw some 126's in and gained the power back, meaning I could hit the limiter a lot easier and, also, I could cruise along at 6k revs without the horrible feeling I was about to see a piston.
Hope this helps.
