Draft sensitive BK stoves? Dealer install Vacu-stack doesn't seem to work for my 22ft chimney (06-plus on manometer) with fluctuating results. Does an excellent job controlling down draft but I suspect cap increase draft with 20-40 mph winds that I have. I installed a cheapie cap flat style lid hoping for a change but summer is here for a few days I did a check on a cold stove with manometer still reads above 06.. Any of you know a chimney cap that I should try been there done that experience or what works for you? I don't want to be blinded by science. When buying a new stove do stove manufactures test chimneys at my height and altitude?