The main thing with folks doing mainly Western horses or breeds of Western horses, is that they tend to try making the feet too small for the “accepted look” of western horses. This is their “ideal” hoof look. Hunters tend to have bigger feet under substantial bodies, need their hooves trimmed bigger, not short-toed, no sole depth.
I used to attend a number of Western type clinics, mostly for reining and handling skills. My horses were large, 16.1H to 17H, with proportionally large hooves, wearing 4 or 5 Kearkart shoes. At EVERY clinic I had folks (including a couple western farriers) come over to offer me the name of a “good farrier who could fix those hooves for me!” When I asked what was wrong with their hooves, I got “they are so big!” I would politely thank them for the offer but preferred to leave the hooves alone.
These people did not know what proportional hooves on horses looked like. No clue that big
substantial horses need bigger hooves to work well in their various jobs. Tiny hooves were what they were used to seeing, expected on all horses! None seemed to relate THEIR horses being lame in the clinic, moving badly, to the small hoof size it was trimmed down to.
My horses are not lame barefoot or shod, because they have the proper sized feet under them at all times. Husband has been a professional Farrier for over 40 years, working on MANY breeds. Most need a lot longer hoof than how they were previously trimmed and shod with! That is why they come to him, he was the “fixer guy” they needed to make the lame walk! Ha ha
Do you have any old shoes used on these horses? A suggestion could be to show the trimmer these old shoes, tell them not to trim hooves smaller than the shoes. Horses went well when hooves were “this big.”
My old western horse was not too big at 14.2, about 900# when fit. HOWEVER she wore size 1 Diamond keg shoes in front with 0s behind. Her toes were 3 3/8 inches long, great sole depth and thick walls, good hoof quality. Never lost a shoe over many years of use, went barefoot often in use. My point is that those were proportional feet to her size, but you seldom see hooves like that these days. Very few horses have that toe length unless they are bigger animals, which length is actually too short on bigger horses. She came from using horse stock, breeders who firmly believed in “no foot, no horse” for their mileage covering, daily ride horses.
Good luck finding a trimmer for your horses. DO NOT accept " pretty and small" as their criteria for a good hoof trim! There should NOT need to be a transition time going from shod to barefoot. No limping or wincing as horse trots away after their trim, unless they have previous sole depth problems. We go between bare or shod with no time off, EVER. We have rocks, hard dirt at times, doesn’t cause issues. Hope your horses enjoy the time off!