10 min wfo? sounds like desert... and I would mix at 25 or 30 to 1 for that baja type stuff, but I have no real experience with that sort of speed/throttle... but between 40, 50, or 60 to 1 in our woods, I wouldnt worry about changing jets in my bike. the cold front coming through or seasonal temp/humidity change would have a bigger affect on altitude density (i think, thats a swag). pick a mix, keep it constant, then ride and jet as necessary. i have a summer tune and a winter tune, some friends run the same needle and main all year long...

ex: right now houston "feels" more like 2000 to 2500 feet above sea level to a carb.