I look at the OB first to get my alignment. If I have done that correctly and I have my bridge set and my CB contact point identified, nothing should change. (The OB is not going to move from where it is.)
Then I focus on my tip as it moves back and forth in the practice strokes. This is the only objective feedback I can get on what my grip hand is doing behing my back and the way my tip moves tells me if my stroke is straight.
Before, during and after CB contact, I endeavor to send that tip straight through the chosen CB contact point, for a good follow-through.
Focusing on my stroke, CB contact point and follow-through has helped me.
I certainly don't make every ball, but I think I missed more balls due to stroke problems than I did due to aiming alignment.
Note: golfers look at the flag before they hit, but the golf ball when they hit.