I have fitted the muffs - had to cut them about a bit but they now fit snug and don't get in the way. I even put small holes either side of the cuts and sewed button holes into them and threaded cable ties through to keep them in place.
Also got some new inner gloves that seem okay but hands still cold, come to realise that my "winter" gloves need replacing and if it's still too cold after that then heated grips/gloves are next.
If my commute was under 30 mins I would be fine but near 40 mins and things are getting numb!