Im sorry for your gel experience. I was very paranoid of this when running Bxx. Always kept a vial of B100, B75 and B50 in my car as my 'is my fuel gelled' indicator (I adjusted the blend depending on the forecast).

Adding kerosene (I can get it at the pump around here) is better than adding winter diesel if you are in a warm climate where they dont add much diesel #2 in the winter.

B80-K20 is good to about 15 deg F in my experience with commercial bio-d.

Homemade bio-d from WVO has different gel-points depending on the feedstock.

All this hassle is why I ultimately switched to WVO completely. Oh yea, and making good bio at home is time consuming, difficult and energy intensive :-)

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car