I have put in a new 6" class A flue for the Leyden. It's 21' from the floor to the cap. I might take 4' off of it though, I ran the flue way higher than normal to try and get the Leyden to perform better. That's what the rep said to do. It didn't help
My firewood is a mix of everything and it all tests under 20%, averaging 17% MC.
The Cod also comes with a moisture meter, I gave it away because I already had one.
You have a very,very nice stove.