Tim : I think that you have the right idea, At least figure out how to 'bake' it at a good high Temperature !
Myself, I am about a decade removed from handling new heating appliances so I don't have a good handle on what is current for shipping oils.
I kinda think that you may have been blessed by the '' Just it time '' supply chain, and your pipe just has not had
enough time to cure or fully 'air dry'
Think like fire! Flow like Gas! Don't be the marshmallow ! For the good of the Craft ! Big AL