Joined: Aug 2010
Posts: 12,728
Likes: 2,106
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
Thanks for explaining the extension, that did not look like an off the shelf windscreen.
If you are new to canisters, they perform best when pretty full. When they are closer to empty, the composition of the gas has changed and it does not burn as hot, especially when cold. If your tank is three quarters empty, it can be slow to heat your coffee water on a cold morning.
If you are out when it is pretty chilly, you can set your stove canister in a shallow pan of luke warm (not hot) water to warm up the canister and it performs better.