With the stand tall, he does a twist in anticipation of the treats and puts his paws up on my shoulder. Any tips on how to keep him straight? I am not luring at this point, but we still use a hand signal, so I am also twisting a bit.
What made everything much simpler with Zac (and I don't think you can see it on the video although I am using this handsignal/lure towards the end in the earlier one I posted) is rather than twisting to lure/signal (which just confused Zac as he takes a lot of cues from my body position) I just put my arm across behind me with my hand in the centre of my back without moving the rest of my body. If you experiment a bit you'll be able to reward him facing away from you from this position. Reward him lower at first, before he starts to twist until he figures out the new system, then reward him in stand tall, then fade the lure and then the hand signal and don't reward until his feet are back on the ground.
Don't worry about the video, although we'd love to see video we'd love you to join in MUCH more