Not really, just the usual things such as be careful about the ground you work on, and good farriery.
I dont know what kind of workload your horses have, but sore shins is also a worry for these types of horses in hard work. If that happens only thing to do is give them 3 months field rest - once they have had them they dont tend to come back.
Im not sure id be keen to take the shoes off this type of horse.
Perhaps the lameness is foot related? Footsoreness can sometimes be very similar to a jarry shoulder.
I dont know what to suggest really, working in straight lines would be the obvious step (ie not on a circle), but then if he wont step out on a hack thats going to be difficult.
Perhaps a full vet/dentist check is in order, and an easy time. Sometimes withm this sort of horse they get into the mindset they are sore, and so dont use themselves enough to loosen up.
If they got everything checked and sorted id be inclined to say x1 bute a day, and long walk hacks with a tiny bit of trotting towards the end.
Hmm, yeah I'm inclined to agree re the mindset thing! He's even a bit strange about going out in the morning, sometimes plants his feet!
Would you go for heartbars or the likes to help with the contracted heels/frogs rather than barefoot? (would just add he does have boots for hacking out in)
I dont really like heartbars for anything TBH. Time and a good farrier will sort out most foot problems.
Sounds like he needs a bit of time, and a lot of patience.