Well today I managed to actually video 20 minutes from the fence post. I've edited it so it's not too long and it's warts (well mostly warts) and all. We have done the stretching down bit and now the telling time....to bring him back up. Only little bits of up, still lots of stretching down and using some opening of the shoulders and of course the higher hand to bring his balance rearwards if he starts to rest on my hands.
It's going to be a long journey and I've been at this point before with him but not much beyond it; so the next few months will be interesting. I hope I can get through the unsteady head :-( and the lunging/twisting down (he does this at liberty in the field too) but I hope we're going to get beyond the impasse...we'll see.