If your idle is off when the engine is warmed up, it will cause you problems.
FWIW my Savage ran fine even below freezing. It took a couple of minutes to warm up, but then didn't need the choke. Bottom line, a stock Savage will run just great in cold or hot weather when properly adjusted.
200 miles is not even enough for the MC to be broke in. Barely enough to be warmed up.
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The ride you described is probably not enough for the engine to be completely warmed up, but it shouldn't die if the choke is pushed in. Won't start, but it shouldn't die immediately. If it won't run once warmed up without the choke there is definitely a problem, and probably a problem based on the ride you described even though it might not have been warmed up.
If adjusting it won't fix it, I'd look at how long the gas has sat in it - gas goes stale pretty quick, summer gas is differently formulated than winter gas. If it's had gas in it for more than a month at any time and been ridden only 200 miles you might be looking at varnish in the carb.
Does supreme mean high octane? If so, why? I'm pretty sure the Savage is set up stock to run 87 octane.