borderline pitches

[gr8fuldiver]

Along the same lines as this thread....I have a habit of calling low strikes. I try to keep my head still, have been told by others watching me that I put my head at a good height (just above the catchers head (but in the slot)), and try to follow the pitch into the glove. But for some reason, I still have the habit of calling pitches low. I would appreciate any and all the help I can get. There has to be someone out there who has had the same problem that found a way that helped him/her correct this error. Is there a "trick" I can use to help me get into the habit of being able to tell the pitch is low? It's really frustrating because I honestly DO give it my best effort, but seem to ere in this area.

Thanks in advance....