I think since you used the software the most you might have the best experience, and so your usability test looks excellent. I really like how you subdivided the test by tasks, it makes it much more organized and easier to read. Good job! I wouldn't really change anything. The format is very easy for a user to skip straight to a section that the user is having problems with. I will be adding sections to my test after seeing how much nicer yours is.

I always get confused when it shows the Post Comment screen again after you post.