Read your essays out loud. Yes, you'll feel silly, but you'll also know when you're straying from the point or using 5 words when one would do.
You have a thesis statement. Does every paragraph support it in a clear, definable way? In other words, if I read just one paragraph, would I be at least somewhat convinced of your thesis? Now ask the same question about every sentence.
Re: Strunk and White (who have their flaws as well as virtues), follow their example in this way at least. They originally wrote: "take out all the words you don't need." Then they rewrote it as: "omit needless words."
When you catch yourself "telling the story," ask yourself why you're doing it. If you're doing it to give context to your argument, can you condense your telling into a subordinate clause? For example: "Little Red Riding Hood goes through the woods to see her grandmother. On the way, she meets a wolf, who tricks her into telling him where her grandmother lives. He secretly hurries there ahead of her, eats the grandmother, and puts on her clothes, so that Little Red will have her guard down when she arrives. If Little Red had been less trusting of strangers, she could have taken greater steps to save herself and her grandmother."
All of that can be condensed as "Little Red's naivete nearly kills both her grandmother and herself."
Seriously, reading it out loud is going to be your best friend on this point.
Mark M.
04/22/17