Yes I do - and Yes it works. AND it can be done from the bottom up - no climbing on the roof. It sounds like you are on the correct path. Make sure your "burn indicator" has actual temps on it. When you get them installed, report back on your peak temp and run temp (when everything settles down for the long haul). The group here will get you on a "best practices" cycle and get you back to heating - and hopefully much safer.