Share 'Underarm Throwing'

I am trying really hard to change my BackHand driving form. I have been playing about 2 years and developed my own form which is essentially an 'underarm throw'.  I wondered if anyone else has made this change and about how long it took to unlearn this habit.   Right now, all of my discs are hyzering out on me but I've been playing a lot of putter/mid rounds as well. A Pro player from Discraft me…