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250 Big Bore Kit Rejetting

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I recently bought at 2004 250 big bored that the owner said was jetted for higher altitude then my area, Fort Collins, CO (5,000 ft). I'm thinking I need to re-jet the bike because it back fires under deceleration and loses power at high RPM's at WOT. I have played around with the needle and fuel screw a little. I moved the needle up one spot to make it a little richer and have played around with the fuel screw make it richer or leaner, but it still back fires and loses power at high RPM's. I'm thinking I'm still running lean and might need a bigger main jet?

 

Any help would be great! Thanks!

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