Another vote for plugs.
Pretty typical foot width, but scrawny-ass ankles and micro-calves.
I battled with Mach 1s for several years to try to get them to work. Went a size down, punched to make them fit. Still had to buckle them so tight to get the performance I wanted that I had to unbuckle them at the bottom of every run due to the discomfort, and they still felt underwhelming. Moved to an Intuition PowerWrap liner which made a huge difference, filling up the volume and adding performance. But still had to buckle them up to the point of discomfort.
Then, on a whim, tried on some plug race boots. They were what I was trying to get the Mach 1s to do, even out of the box. It took a bunch of trips (12?) back to the boot fitter to get them just right. But now they're magic. More comfortable than the Mach 1s, the performance I wanted, and no need to strangle my ankles with the buckles done up to max tightness. I love them, for everything. Never going back.
I solved the cold feet problem with some heated compression socks (the Lenz thin ones).