Subbing to watch the progress on these hooves with a competent farrier/trimmer. Pics with results please and soon! :)
No wonder the horse doesn't want to get up: it probably hurts and the balance is too difficult. Then you've more than likely got other health issues from the horse not moving properly or enough. But, as others have said, there is no reason not to get inches off of those walls immediately. Fine tuning may take a bit of time. And as for no thrush? Hmmm... I wouldn't count on that. Once those feet get properly trimmed up, I think you'll find some ickies in there still.
Once the initial trim is done, I would have the farrier/trimmer come again in two weeks and reassess.