The reason why it would be hard to start at altitude could be if you only changed the main jet. That'll make no difference at all to idle mixture. You need to change the slow jet. But that's another fiddly annoying thing to be playing at.
Dropping your needle helps as well, but short term 'fixes' include taking the cover off your airbox if it has one, running with no air filter, and trying to partially close your fuel tap so the float bowl can't stay full.
Looks like a handy little bike. Are the clutch cover and internals compatible with any of the older xr models? If they are you might be able install the kickerstarter. (you can do that on the xr650l and dommie for example)
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