I'm just posting this to hear others thoughts like everything else in slingshots it's all personal preference.
We're all told to practice are fourm elbow up back straight dah dah dah .. but how many of us really do it ? Not me lol an I bet a lot of us don't drive are cars with are hands at 10 and 2 or put are pinky fingers up when we drink tea.
Myself I shoot instinctively as fast as I can get the marble in the pouch forks straight up and down just winging them I have more fun that way. I just let go when it feels right
I can't wait to see some pictures and read how you all do it!