Hi, @blaineb, thanks for stopping in for a comment. I'll try to answer your questions with my opinions.
In my opinion, the most important thing to focus on when you post is to create good content. You want your article to be carefully and thoughtfully written. Check it for spelling and grammar. Try to write about things that are important to you and that you know about. Don't just copy someone else's work. Write things that will make other people think, or smile, or want to know more.
I think that "the time at which you post" can also be important, but I really don't have good advice for you. I think a lot of it is luck, and when a "whale" might notice something interesting that you wrote.
Good luck!
Much appreciated for your time and well thought out and crafted response!