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XR250 with Mikuni at 5000 ft

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I have a 2001 XR250, bored & stroked to 300, ported, big pipes, etc, with a 33 mm Mikuni flat slide pumper. It runs great and starts easily when hot, but has to be kicked to death to get started when cold, regardless of what I do with the the choke knob. Current jetting is 137.5 main, 40 pilot, 5FP96 needle in 2nd groove. Valves were set by local Honda dealer to stock specs. I live at 5000 ft. Does anyone have experience with the pilot / needle setup on a setup similar to this at my elevation? I suspect that's what my problem is.

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