If you don’t have cracks in the supply lines between the tank and the burner, and the burner works for the correct duration (what you know as a typical duty cycle), then it is likely the blower overheating.
Can you tell where the smoke is coming from exactly? What does it smell like?
Yup, it comes from the area where the fuel nozzle and electrodes are inserted. Everything is calibrated for 70/70a. The "smoke" filters back through that area and out the oil pump's air inlet dial. Since doing all the work, things are running fine minus the blow back smoke. It smells like kerosene cooking, not burning (if that makes sense)
BTW, this is NOT in the heating ducts. ONLY at the source. It is not dispensing throughout the home.