Originally Posted by YawningDrone
crunched against my chest?
Yes, your upper arm(bicep) is too close the chest during the throw, so there's not much extension. Do you know how to do a chicken wing with your arm, where your hand is near your arm pit with the elbow straight out from the shoulder? That's more what you want, more width of the arm/bicep from the chest. You will have to change your stance and aim more backward.