I see a lot of heel taken of and it could be the angle but a couple hooves look like they weren't taken off level; not that being I level would make the horse lame.
Have you seen 'before' pics of this horse walkin? I wonder what you're seeing that make you think 'too much' heel was taken?? I agree fully, that IF heels were massive & heaps lopped off in one fell swoop, that's a recipe for disaster. It's not just tendons & ligaments that will be strained because they've adapted, but the actual structure of bone changes to align with the forces on it, so will be weaker with significant angle change, until it adapts back.
But in these pics, the biggest thing I see actually are *overgrown* heels & bars. It appears they're all 'run forward' to some degree. But no matter how much they may 'need' to lose, it should be done gradually, not in one fell swoop.
& Sarahfromsc, yes, that kind of big weather change - the record wet bit at least - can absolutely make horses more 'sensitive'. Just like our own skin after a long bath, wet footing softens the 'skin' of their feet. IMHO there is never a reason to just accept 'tender after a trim', but there are sometimes reasons for it that aren't due to 'farrier error'. 'Low Grade Laminitis' is one of those possible reasons.
OP, as well as the possible massive change to heel angle, IF they were a lot higher than that, I agree that it's possible a little too much might have been taken from the toe walls. I don't think that would have caused soreness though. What I suspect is that sole was pared. Can't tell whether that's happened, but soles don't look deep/thick anyway, and a farrier who routinely carves frogs like that usually routinely carves into soles too. Thinning the 'skin' under the foot will of course make a horse more tender, until the callouses can grow back.