The problem with snow maps is if they are 10 to 1, they will be too high in marginal areas…and that’s not because the model was wrong, it’s because people forecasted using 10 to 1.
That’s one reason I like the QPF maps better. Easier to verify the model performance. But in your area, it’s prob fairly safe to use 10 to 1 since most of your snow is falling early with a cold column.