For anyone who's interested how this progressed, here's a follow-up.
After he's gone into the Softride boots and was turned out to a paddock during the day, he improved a lot clinically. We have taken him off the anti-inflammatories and have changed farriers.
The trim job that the guy did that's shown on page 1 of this thread brought a world of trouble with it though. Rasping the hoof wall so thin in the front, plus the white line separation, makes it constantly crack and flare out now. Also, the fact that the horse has been left to walk on the soles exactly in the spot where the rotated tip of the coffin bone puts the most pressure on it has bruised that entire area on both front feet to the point where he is now about to blow out abscesses. So... not impressed. Luckily our new farrier knows what he's doing.
The horse is still - clinically - a LOT better than directly after that first trim, and has never again been remotely as bad as back then. So I don't even want to imagine how painful it was, if two massive abscesses are a great improvement... :(
Posted via Mobile Device