Berlin wrote: Your chimney probably isn't high enough which makes a significant difference in the draft you experience.
Quoted from an older post that is linked above.
daluds wrote: The chimney is roughly 26 feet tall going from basement to top of first floor roof of a cathedral ceiling family room right above the boiler room or basement. The family room above the boiler room has a 16x24 foundation off the main house. The chimney is capped for rain, etc. The chimney is lower than the top of the 2nd floor roof by about 12 feet.
I think the chimney being 12' lower than a nearby structure is contributing to the draft problems.