I already know I'm going to hate the term "displaced polar vortex" in the next few days.
Back to the models, I'm not too excited about day 8+. I think with the vortex having some respite it looks like it will move west back over the North Pole again, so I'm favouring the JMA, perhaps not that quickly though. Though I think it's much more likely we'll have high pressure over us rather than a raging Atlantic like JMA is expecting. After that GFS is going for a much more significant warming with the vortex displaced to Siberia again so we could be on for a repeat in 2-3 weeks.