Alan,

Check the NASGA site. I think there are some posts on it...maybe even video. I'm doing it tomorrow for the first time in a sanctioned competition and since it's hard to practice unless you have the implements--just watch others and notice it's ALL in the stop. Stop the movement at the top of your shoulder--it will make the sheaf slide off the forks and give you a straight vertical release.

You're bigger than me so your arm swing should give you good momentum without feeling like you have to 'pop" it until you feel more comfortable with the release.

Hope this helps.