Here's what I suggest you do.
Apply some more pressure with your index finger because that's how I got mine wrong.
When releasing with your middle finger when I began I closed my eyes and released it to minimize the confusion
Keep Practicing!
Yeah, I wish there were more magicains/flourishes in my school. I'm the only "real" one. I say "real" because there's a few "magicians" that aren't that good and there are no flourishers. I'm going to try start a magic/flourishing club next year in high school.