oil heater air fuel ratio question

Anonymous's Avatar (by Gravatar) by Anonymous in  Climate Control » Heating 

On my oil heater adjusting the air band and shutter I see the flame getting larger and larger as i decrease the air. Set to the smallest air intake the flame is the largest. I never see smoke.

I did a complete tune up last season and noticed this condition, then and again this season.

plz look at these videos of my flame and comment:




these are both at the same A/F ratio.

Your thoughts?

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