I know you don't want to be repetitive, but you don't need to have a new method every time. There is some character growth here, something most stories on this site don't have. I am pretty fond of decapitation as well, and it makes a lot of sense for a butcher. If you like certain methods, use those, write for yourself and people enjoying it will follow.

Although I do like garroting tied to a post, the slow one where they crank it. :)