But someone whos horse moved like doug and then put hinds on made a big transformation and had a happy moving horse.
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He's a pony and it's spring and he's getting grass and supplementary food?
I'd suspect that long before I'd suspect thrush, though I would treat for both. Try restricting his access to grass before you think of shoeing.
I'd also recommend that you drop the Top Spec and the alfalfa, which a lot of horses reportedly have problems with, and make sure your balancer is one of the newer ones that has a lot of copper and magnesium, not much, or any, manganese or iron, and also contains yeast. Pro Hoof from Progressive Earth on ebay is a good one. PM Oberson for advice about what to feed him.
Unfortunately not the typical 'pony' hard to keep weight/condition on him throughout winter as worked quite hard. He isnt footy as in laminitic footy at all. I use baileys lo-cal balancer? This flat footedness as been going on for quite a while not just since the grass is growing through.