Be very consistant with your form and release.
The way you are describing your groups 30 yard groups would be 6 or more inches. with 3 inch groups at 15 and 4 inch groups at 20.
Have the guys watch you shoot and if they could get them to vidieo tape you shooting so you can watch at home.
good Luck!
Greg
"Getting close to the game is the joy of Bowhunting for me, the harvest is a bonus."

Live 15 ft Python after eating a small Antelope!