Leon,
I don't have much experience with below freezing running but ....
You are running mostly tight tracks, when you go for full throttle is it just an instant & you back off or do you spend a while trying with it wide open?
Reason is when I was playing with my jetting a while back when it was too rich I had loads of black spooge and after a while in the woods it would hesitate on full throttle and take a few seconds to clear, then it would rev out.
Try it on a flat open bit - maybe cover the rad to make sure you don't cold sieze. Obviously it wont run right if the engine isn't getting hot enough - warm it up and see if it'll run WFO. If it clears after a few seconds then revs out you probably are too rich.
I once fully covered both sides of my rad (thinking I would remove one side later and forgot) when it was about 0 deg C. It ran for 1.5 hours before boiling and I think that was only because the air temp had risen to about 5 deg C.
Ian.
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