[Breck]

go back to the yard and basic 8 white bumper only wagon wheel or 5 pile 1/2 wagon wheel drill that you say he was good at. except this time incorporate a bird boy in the drill. Wagon wheel only needs to be 25-30 yards. Have bird boy stand at one pile while you work on lining to another. Then add movement. Low swinging bumper, arm up swinging bumper, both arms up waving etc. play around with that for a while. Use low collar nick and no here/heel if dog looks a bird boy. when he locks in on correct pile, Good, right there, back.
Make bumper piles highly visible on mowed soccer field height grass.

 

[Breck]

we are about 2/3 thru transition on the flow chart..

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OK you're at a perfect time to really solidify your yard work and fine tune how "you" move and communicate (not talking just verbal) with your dog.. Do you use a pinch collar and short training tab? On your wagon wheel stand still. When you move to new pile move just your feet one then the other. Try not to move much else. Teach dog to move in sync with that, look in the new direction and no where else. Once you can do that real well you're cooking with gas.
In the field right now avoid temptation to run doubles and triples all the time. Run mostly singles.
Cheers

PS to clarify what John posted if you do like I described or tried to describe you will have tools to solve both problems. Dog that won't move off of a gun and one that head swings.

 

[Breck]

Don't rely on gun shots for anything. Actually don't rely on throws either. Think of it this way. When your dog can do a quad and the only shot heard or bird seen thrown by the dog is from the flyer. Do that you're doing something.
So, sort out how you will adjust your training so not to rely on those two things.
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No stick and don't pull on pinch collar to move dog. Speak softly to dog. Here, heel, no, good. As you get better dog will move with your feet without you saying anything. Same as dog out of position a low bump without saying anything or a soft voice "cue" (something other than sit heel here) will bring dog into position.
Remember when pivoting dog his butt stays in contact with ground until sent.
Remember you need to tie together in perfect sync and alignment Sit, Heel, Spine, Eyes.
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.so again work on this in yard so dog understands when he is to move with you and it will help.