based on my own experience with gelling fuel/fuel filters, the engine would idle fine, but would die out once I put a load on it (increased need for fuel with higher rpms). So it’s probably not a fuel gelling issue (but you never know).
I use the silver bottle Diesel Kleen in my diesel fuel; never had an issue, so presumably it’s working (i’m in upstate ny too)
How is your coolant level? Wondering if the white smoke is vaporized coolant.