I don't have a whole lot of confidence in my trimmer. I suspect his ego is greater than his skills. Been trying to get a real good farrier and still trying but of course he is very busy. I watch my horses move, all the time. He's not sore or short-striding and the ground is level. Nothing has changed except perhaps how he was trimmed.
There's a lot of that "Legend In Their Own Mind" going on these days
Once upon a time I had a pretty good barefoot trimmer start trimming for me because I'm just too old and have the arthritis to prove it.
Three years down the road his young self got in such a turmoil over the antics of his daughter's mom, that it affected his trimming ability - on all four of my horses.
He sored one horse three trims in a row and, on his last time to trim, darned if all four didn't have serious hoof chips only two weeks into the trims.
My two mid-20's fellas have been hoof "chipless" in the 22 and 19 years they've been with me. When I saw their hooves chipped to h**l plus the third one sore, it was the last straw. I took all four back.
My vet helped me find a wahzoo farrier to do the corrective work that two of my horses need and I'm not capable of anymore because my hands hurt. I can struggle thru the other two since this guy charges double the going rate for a trim around here but, he is worth every stinkin' rotten penny
I hope you can get someone good pretty soon, as it sounds like the problem probably is holding the hoof nippers