Andy, the warm tone on that XTOL negative isn't a result of the developer being old. Both negatives are of relatively high density. XTOL has always given warm tones in high density areas. It's also associated with "mushier" grain and lower acutance compared to your FX-55 negative.
The only other technical nuisance comment I can provide is to remind you that there are things called hand warmers available for your pockets. Placing your hands in there intermittently will prevent them from getting red or, even worse, frostbitten. Putting one under your cap might even avoid exposure calculation errors.
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