Take this for example posted this morning, and compared it to same image at Pivotal.
https://maps1.pivotalweather.com/maps/models/gfs/2021021112/111/snku_acc.us_c.png
You have a sub to pivotalweather? Euro Kuchera is only available with sub. The numbers are off though, so I'm not sure if Pivotals or Weatherbell's algorithm is off.
The main failure point would be a weaker wave that doesn't take on a neutral/neg tilt. If this is just a positive open trough, then that wouldn't be good for big snow totals.