It sounds like the problem here is more of a timing isssue. In the runs that snowed the precip came in earlier. But with the most recent ones...things develop so slow that the cold air is already scoured out by the time the storm gets here. But I could be wrong. @psuhoffman feel free to clarify
I was about to say...as good as it has been, I'm sure eventually there will be a pattern/setup it might struggle with! I mean that solution there looks like it's copying something suppressive from 10 days ago, lol