Sorry to hear it didn't help much.
If you are getting cold air in your ductwork supply, then I think you are either drawing very cold air into your duct intake, your baffle is cracked or moved to the front, or most likely you aren't making heat in the firebox.
It's been a few months and a few different threads and dozens of suggestions, that I don't have all of your furnace efforts organized in my mind. I encourage you to go through the threads and make a list of all the suggestions and start trying each one and letting us know how it goes.
To me, your results are so abnormal that there is probably a major problem with your installation (chimney, draft, ductwork) or burning (wood, moisture, damper), and the furnace is very unlikely to be the problem. You might consider finding fellow wood burners near you who could come and look at your installation and burning habits in person, because thus far we haven't had enough information to find the problem.
How is your weather? Do you have much more time to experiment with your furnace this spring? Around here, I am done burning until next winter.