Give it time, son!!! The main reason many former compound users fail to totally commit to Traditional Archery, is because you can't get as GOOD, as FAST, as you can with a compound!!
First! Forget about "groups"... Consistantsy is the key!!! Leave your quiver in the house. Take your bow, 1 arrow, and a paper plate, out to the range. Make a small dot, in the center of the plate, and put it on the backstop. The "goal" is to hit the dot... BUT, the object of the game, is to put EVERY arrow you shoot into that plate... EVERY TIME!!!!!
When you start hitting the dot on a regular basis... Then you an try shooting "groups" and I'm sure you will be very happily suprised!!!!! Keep at it! Don't quit! And keep us posted!!! Good Luck & have FUN!!!!!