Don't feel bad. I struggle to break twenty, only done it a handful of times in my life. I dunno what the secret is. Tried a variety of stances, bridge lengths, and cues. Maybe I need to start working out.
I got the phone app and found out that the best I could get was 17 MPH with my favorite 21 oz. one-piece playing cue. Haven't used it again in months.

I've never, ever worked on my hard break because I'm mostly interested in straight pool, but I thought 20 MPH would be a walk in the park for me.
Just curious... Would a good break cue automatically add a few MPH to my break using the same technique I am currently using?