I don't have experience with your conditions and I think differently than most people but what I will say is I like my needles in the middle (3rd spot). Years ago I found that when changing clip positions on the same needle I would need to change jets also. Now if I am going to run and extreme temperature difference (winter) I change needle only (same middle 3rd spot) the Jets always remain the same. I go buy Yamaha's chart:For me I always run 45 pilot, 40 power jet, and 175 Main jet. 95% of the time I am at 40-80°F and the N3EW-3 is perfect. When I am going to run a lot in the winter (10-40°F) I switch to the N8RW-3 and it's perfect, jets all stay the same. I don't ride 90°F much but if I was going to ride a lot at 80-100°F I would run the N3CW-3 with the same Jets and probably love it. You could try the same thing with all needles on clip position 2 for your elevation. If I was going to visit your area I would try 45 pilot, 40 power jet, 170 Main jet. Most of the time I would try N3EW-2 and winter the N8RW-2. It all sounds complicated but trust me I'm not real smart and I like things simple and reliable. When it sunk in it became pretty simple. I don't ride a lot in the winter anymore (age and it gums up power valves) and I don't mind stretching the temperature envelope 10° on each end occasionally so I rarely change anything. Hope it helps you find your setting.