G'day,
from a quick scan the previous advice provides all the necessary help. One tip that may have been missed is: relax the hand holding the bar - soft hands take catches - cricket or baseball.
Perhaps OWT, witchcraft, but, if your hand and bar are almost in the position normal to the shop head, then a soft hand may allow the bar to settle into the normal position as the gun rattles the factory head.
Regards,
Bob