I live at the same altitude as you do, so I can definitely get you close on the carb tune.
As far as the tires. I never had a 90/10 tire, but the Shinko 705 is an 80/20, and it makes the hawk a completely different bike on the road. It's decently capable off road as long as you don't try to go through mud or wet sand. They will also last a REALLY long time. I had over 1500 miles on mine and they were barely starting to wear.
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