"how does Sanyo get away with 50 percent more heating than cooling?"
It isn't uncommon for an inverter mini-split to run at a higher RPM heating than cooling.
The spec sheet from the Carrier 25VNA central air inverter 36k heat pump runs the compressor at 1800-4500RPM for cooling but when heating it will 6850 at 44 degrees F with a full duty call for heat and the spec sheet says if the outdoor temperature is right it can even spin at 7000RPM. If you run the unit at 0f it's likely running full bore as long as there isn't a call for aux heat that might otherwise drive it down or shut it off.
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