You've got to be careful asking bowyers too. This sounds crazy, but a lot of bowyers have never experienced shooting longer bows. They build what the biggest demand asks.
I had a great local bowyer who only made up to a 60" bow try and explain to me that I dont know my butt from my elbow, and his 60" would be just as smooth and accurate as anything longer.Refused to build me a 64". Come to find out, he never even SHOT a bow over 60"!!!!!!
And his bows are of incredible quality. He has since shot some of my 64 and longer recurves, and just smirks at me when his "old" opinion is brought up.
I'm not saying all longer bows are better, just make sure the guy who you are asking knows what he's talking about. Even some of the pros out there can learn a thing or two sometimes.