With my left hand at the top of the broom.1. Stop focusing on your shot, and concentrate on stickhandling (advancing/protecting the puck & deking is the much more important skill to master).
2. The hand at the top of the stick (knob) is where all the control of the blade should come from. The hand on the middle of the shaft is just (mostly) acting as a fulcrum for leverage and support.
3. Thus, in theory, the dominant hand goes on the top (knob). i.e., right-handers shoot left and vice-versa
4. An ad-hoc way of figuring out your natural preference is to have someone hand you a broom and start sweeping. How you hold the broom will show you how you ought to hold a hockey stick, which dictates what blade curve to get.