10-3-A and 10-3-B

[HungryBear]

Is there reasons to select 10-3-A Punch, in stead od 10-3-B Pitch when swinging. I have not been able to locate much info on this here but I am of the "impression" that most discussion on this forum is with 10-3-A even for swingers. Because of sequenced release the palm should remain up during #2 release and as the left wrist is uncocking the right forearm is allowing this without unbending the right wrist. At the point the LFFW swivels to vertical the right forearm still has a long way to go. I have a problem with running out of right arm unless I exagerate the down plane right shoulder to the point where it must be well past parallel to the plane line ie. estimateing 30 degrees past . because I can't move my right arm fast enough that it swings freely and retains #3 pp Now with the pitch stroke the elbow is in a position to move smoothly and allow the right forearm to fan through retaining #3pp feel.
Can you help me with a better understanding of the why? for right elbow/forearm/sholder anction as it relates to pitch vs. punch when swinging?