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Colorado jetting question

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I have a 2003 DRZ 400 E, removed snorkel, and a procircut slip on. Im taking a trip to Colorado and riding around 9,000 to 12,000 feet. Right now i am using (and have used in the past) a 140 main jet and the needle on the 3rd clip. Last time it felt like it didnt have much power on take off, ran fine otherwise. I have the james dean kit, but seeing a couple of these post made me think his smallest jet was a little big for that altitude. what would be the best way to go on this?

thanks

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The needle i am using is the stock needle, i just bought the 140 main jet.

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ok,well the stock needle works fine at those elevations.3rd needle clip is to lean.4th is the leanest you want to go.

140 main jet is fine.

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