As Kynetx mentioned, blending in some Biodiesel does seem to help.
Home Heating Oil does not have the anti-gel agents added like in winter transportation diesel....so if your sneaking a little into your tank at times be careful in cold weather.
If Biodiesel is not available where you are try adding some Marval Mystery Oil
or Transmission Fluid to the USLD which should quite injectors down a little.
__________________
FRED
Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K