re the smaller jet, if you do change it over be sure to change it back below 3000m other wise the engine will over heat and the damage would be really bad.
For reference we had some altitude probs with our transalp but the problem didnt start until 4200 m's.
we took the airfilter out, cleaning the sparks at the same time and made it to 5200m with out too much agro, altoughh I must confess that it would NOT rev over 4500 RPM. This is where your smaller main jet would be really advantageous....
Hope this helps
Simon
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