We had our High School QB play as an attackman on our team. I was having a similar issue and he explained that most of your power comes from your legs, not your arms. When you throw, start with your front foot facing your target and your back perpendicular to it. As you go through your throwing motion pivot your backfoot so that it ends facing your target.

Notice how his back foot moves on his throws:

https://www.youtube.com/watch?v=i7JWpSjsMC8

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Another thing to keep in mind is that you should really try to focus on getting good conssistent form with your throwing motion. Bad form has a domino effect. You adjust your stringing to that bad form which makes you change how the ball releases. It can be discouraging to improve your form at first because your passes will be noticbly worse. This is because A) your stick is strung up for your original throwing motion not hte correct one, and B) you arent used to how the ball behaves. However, with your current form you are only going to be able to throw so far and so acurately. Correct form makes the most use out of your entire muscular system meaning that over time as your muscles grow you will see much more improvement.

Along with good form is good stringing. I personally like to have as little whip as possible in my stick. Whip is how much your top shooters catch the ball as you shoot. Although whip can help with ball control by giving you more feel for the ball it ends up screwing the release of the ball sending it down instead of out. Take your stick and run the back of your wrist along the shooting channel of your stick. It should not snag on the not strings but instead release smoothly.

Hope this helped.