That is why a simple draft test/ measurement would confirm the higher draft if that be the case and from there a clearer path to resolve the problem. Personally if that was my problem I would certainly have one and then get on to resolving the problem. with no maybe's, perhaps or it could be, nothing like certainty.
Well yes obviously a measurement would be best. But I am not there to measure it
What was done at the bottom of the liner? Your symptoms really sound like excessive draft now that wet wood is ruled out but I am just trying to cover all variables
I have a damper in the pipe already.That wood does really look dry! Still worth a check. Worth checking the entire vent from collar to termination. Who knows. Is the connector pipe running up hill a bit in any horizontal piece? Not sure what your configuration is? Pics may help with suggestions here. Did the connector pipe get changed out? Spitballing
I had a Century stove that really needed a key damper to retain heat in the stove instead of dispensing of it (quickly!) up the pipe. I wonder if this might be something to try? It's cheap and simple to install. Your new liner may be pulling harder and smoking through your load a bit quick. Slowing the burn rate and keeping some heat in the stove may be worth a try. Or do you have a damper already?
What should have been done?
No the bottom should absolutely not be open. The liner either needs to extend down to the clean out and then be sealed in with mortar and a sealed clean out door. Or a tee cap on the bottom of the tee.
Basically a certified chimney and or wood stove installation professional.
