Is this the problem?
Using GFS here, but at 850 winds are already either west or south west, and this is at 18Z Sat. Wouldn't we need a little more of a more northerly component, at least up in northern New England, to prevent the warmup?
I honestly don't have the skill set to understand if what is depicted (it might not even be the right map to illustrate this) is either a cause or an effect as to why the models keep churning out more warmth than expected. But it seems that arctic high is more strung out west to east in terms of influence on the models, and that's why that low is allowed to barrel farther north than what we would normally expect.
I'll be honest I agree that things "just don't look right" compared to what we would normally see but I couldn't tell you why, lol.