RE: Rushing The Shot Problem
If you're close enough to go and personally help him out...you may try this. Have him shoot only on your command. He draws the bow with his finger behind the trigger and then you go through simple commands of repitition. Something like; 1) "find your target" 2) "move your finger to the front of the trigger 3) shoot
After each command, you wait a second or two..forcing him to hold position...before you give the next command.
I have seen this work before. Good luck.