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"their best setup there" is not the best setup for your bike. each bike lives in a different environment, with different air. each bike needs individual tuning. finding a recommended value is a good starting point but 9/10 times wont be the correct value.
i think its best to start tuning with the pilot jet since the needle closes off the main when idle. its a good seperated system and it effects the main system so its good to start with the pilot jets. start with the largest pilot jet and go down in jet sizes. you are looking for the highest idle. for each pilot jet size, you will need to tune the pilot air screw to the max idle. write down the max idle you get for each pilot jet and pick the highest jet and mix screw setting. once you have that set, return your idle to 1500 and start tuning your main jet. start with the largest main jet, and go down in size until the wide open throttle high RPM power stops getting better. once you have your pilot and main jets correct, then you can tune the needle if it needs it. if there is any struggling when transitioning between the pilot and main jet, thats the responsibility of the needle. if it stumbles around mid-range rpm, the needle could be adjusted incorrectly, do a midrange rpm plug check and adjust the needle accordingly.
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