Good evening Eric,
The Musa sikkimensis may be a very good banana for leaf hardiness in marginally warm/cold environments like ours. I grew up about 40 miles NW of your current location and I am intimately with that environment.
Musa itinerans is another very good candidate for the best banana for leaf hardiness. It may be difficult to get the cold data we need for accurate conclusions in a year, but if we continue the data documentation for several years we may get the answers we need.
This year has not been a cold challenging year for data entry on my part but I do very much appreciate the information you have provided to the forum this year. Great picture, Thanks.