One of the things I've done that has helped with my writing consistency is to use whatever version of "project" or "library" your LLM of choice has and pre-load it with a technical writing guide (I used the Red Hat Technical Style Guide[1]) and push my docs through that to identify improvements. It has been a great way to keep my own writing consistent and remove randomness from just having my own writing improvement prompt.

1 https://stylepedia.net/style/