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[RSI]

How many sq ft is the house (all floors combined) How well is it insulated?

[fryedaddy]

My father has the exact same setup as you and is able to heat his 2,600 sqft house and
1,000sqft shop up to 74 degrees. He's said his temp doesn't fall below 150 degrees
overnight. He does have 8" an 8" metal flue instead for the chimney like you have but
with (3) loads a day it sounds like draft isn't an issue.

You shouldn't have to keep the dampers open, that is very inefficient.

It sounds like your heating load may be to large for the unit.

[jd]

Place a cooking thermometer where the line enters the house, this will be compared to the furnace water temp. then put it on the line leaving the house.  this will tell if temp drop is in line coming to house or if it is the heat exchanger sucking the heat out.
just a theory

jd

[RSI]

Place a cooking thermometer where the line enters the house, this will be compared to the furnace water temp. then put it on the line leaving the house.  this will tell if temp drop is in line coming to house or if it is the heat exchanger sucking the heat out.
just a theory

jd

You would need to do it at the lines at the boiler too and not just compare to the thermometer on the boiler.