I have a masonary chimney on the outside wall of my home it is 26 ft tall with 6x6 tile liner, I am running a epa stove on it the problem I have is it just takes a longtime to warmup and establish a good draft when the chimney is cold, I have been thinking about putting a SS flex liner in it Do you all think this would help with the drafting problem ? I would probably just run the flex from the thimble up to the top of the chimney..Thank`s !