I have the same bike, and pretty much the same type of terrain. I'm at about 5k for altitude, and ride up to about 10k. Here is what I'm running.
N3CJ needle 2nd position summer, 3rd position winter
170 main
40 Pilot
My squish has been cut to about 1.5mm on the stock head. I left the combustion chamber alone. Compression is pretty high, but it runs fine on pump gas. I've even visited friends at sea level and only had some pinging at idle after a hard run. Nothing a twist of the air screw couldn't fix.
As far as power, it lugs extremely well. Just when I think it's going to give up on me in the middle of some stupid rocky steep climb, I twist a little more and it keeps going. It still pulls hard on top, but there is barely any hit. It's very smooth and predictable.
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2013 GasGas XC300E
2005 YZ290
1973 Honda CB175
1997 KX60
1983 Yami Tri-Zinger
1984 Suzuki Alt 50
1969 Trail 90
1971 Trail 90
1972 Trail 90
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