May have narrowed this done to one word…creosote. The challenges of smoking meat in frigid weather. Did some bacon on my next smoke and while not as bad I could identify that same taste when I test fried an end off the slab. One thing I have learned over the years about creosote—it is amplified when it appears on cured meat. I started looking at my setup and I think two things led to this–1, using cabelas pellets for my smoke source and two, the cold ambient temperature in almost dead calm weather caused my stack to not draw as well–so a pellet known for high ash and incomplete burn caused some creosote rather than nice smoke.
I am still looking for advice and other ideas so feel free to jump in—would really like to master the ham making.
EDITED TO ADD…I use a homebuilt electric smoker with a PID controller. Only use pellets for smoke source, not heat.