I don't think you should call these rules to improve writing. I think it would be better if you called these guidelines. Also, "rule" number one seems kind of pointless. The spacing of lines does not improve the writing in itself, just as it doesn't make a piece better or worse depending on the font. While the font and spacing changed how easy it is to read the piece of writing for some people, it would be wrong to say it improves your writing in itself.

I agree with things such as know what you are writing about, however. Research is important to convey something already existing, in a realistic fashion. As someone who knew a guy who stuttered, however, I would like to point out that pl-l-lease can be a stutter, as well. One can get caught on the L sound just as any other sound.

Furthermore, I personally did not like your bashing of a cliché. While a cliché might not be what you like to read, someone else might. This is merely a personal taste and so, rather than say it to be wrong, why not encourage to find one's own kind of ways of expressing? I believe a cliché can be a cliché for a reason; while some reside in the lack of imagination others are a cliché because people like them, so they use them again.

For taking the time to write this out however, I do appreciate the effort. It personally did not suit me very well but if it does to others, then good for them. I have been part of a group of writers that have always believed rules are secondary to imagination and creativity, so naturally, we seem to be at different sides of the writing spectrum, so I respect that this is your view while I have my own. Let's not argue a right or wrong. Anyway, I do hope you got your joy for creativity back after you had it sucked out of you while studying English Literature.

Keep safe.