Altitude improves the performance of compressed gas stoves. Cold is the problem.

You already have been given good advice on how to keep your canister warm.

Be careful with inverted use on the MSR Windpro. The stove has to be started with gas and not liquid fuel. For inverted use it needs primed similar to your DragonFly.

Hurry, the peak colors have passed.
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"In theory, theory and practice are the same. In practice, they are not."
Yogi Berra