I had a very similer experience with a particular bowyer's bow as well.
I had a bow custom built by a popular, very good, well established bowyer. Absolutely beautiful shooting bow, and still is.
Two of my buddies loved shooting my bow so much they ordered the exact same bow, length, poundage woods, etc.
When there bows arrived 6mos later, both were disappointed. Both bows were nice, however, were not as smooth as mine nor as quiet.
We could never expain why?? Always been a mystery. Looking back my buddies probably should have contacted the bowyer to discuss why.
chris <><