In Park City is Bret Amsbury and Matt Shiller, two of the best. Matt doesn't sell boots but will give you a recommendation then you return with the boots and he will fine tune them.
I saw Brent last week picking up my new alpine boots he worked his magic on.
Curtis at Sports Den on Foothill is good. He always has time to talk and while he doesn’t work by appointment, he does get busy at times. Sports Den tosses in a semi custom footbed over the Labor Day weekend sale.
I am looking for my first AT boot and tried the only boot Brent had on hand. It wasn’t close to working with my feet. I’ll go back when he has more boots in stock.
For my wide feet he’s mentioned the boots below. I have talked with him a bit in years past and this trip was the first he thought he could get me in something light-ish
Fischer Ranger One-His comment was “you have enough alpine boots already”
https://www.fischersports.com/us_en/ranger-one-130-pbv-walk-dyn-1059?c=5327&number=U14019
Atomic Hawx Prime XTD 130
A comfortable and extremely powerful all-mountain ski boot, the top-end Atomic Hawx Ultra 130 S GW offers a narrow, low-volume 98mm fit.
shop.atomic.com
Salomon Shift Pro 130
Designed for skiers who love to charge through unspoiled powder at high speeds, but are tempted by the occasional escapade to hike a new peak, Salomon's SHIFT PRO 130 AT combines the stability and power of a true alpine boot with the versatility of a tour
www.salomon.com
He also mentioned a Scarpa that is 103 last that is a few seasons old with the current model being 102.