Ashful
Minister of Fire
Make the cap isn't that restrictive and buy a soot eater, you got some height there my friend
If your height exceeds the range of a single sooteater, consider buying two full kits. When I was buying for my taller chimney, I found two full sooteater kits was the same or less cost than buying extensions for a single kit, and I got a free spare head and drill adaptor, to boot! I need to use almost all of two full kits to reach the top of my tallest chimney.