Your wood is wet, no question about it. I have a smaller Hearthstone stove and they are very finicky about dryness of the wood. Last week my husband took wood off the wrong rack and I had to leave the door open and air open and not getting much heat out of it and having it gone in less than an hour. I had to open door a lot and rearrange and got smoke in the house. I also saw the wood was very black while it burned and left big black unburnt chunks. I split a piece of that wood tested it with te meter and it was 22%. Not ready for prime time. EPA stoves need very dry wood and my Hearthstone loves 15% or less, 20% is marginal. When I have good wood, they turn grey while burning and I get a very fine white ash with no chunks at all. The embers that are left are glowing bright orange not black. Black means wet wood.
***** IF YOU HAVE TO KEEP MESSING WITH IT, YOUR WOOD IS NOT DRY ENOUGH
!**** Until you test a freshly split log with a moisture meter and prove otherwise, I have to say your wood is not up to par for an EPA stove. If any part of your chimney is outside, your 8 inch chimney is too big for proper operations on that stove. For ideal burns and utmost efficiency you need very dry wood and a 6" insulated liner in your chimney or that stove will never make you happy.
***** IF YOU HAVE TO KEEP MESSING WITH IT, YOUR WOOD IS NOT DRY ENOUGH

