notwomamils

I hope you can help. I'd like to build a bike off a fairdale weekender drop frame, but I don't have a dealer nearby who is willing to order in unless I buy, which makes the sizing difficult.
I've emailed Fairdale a couple of times but haven't had a reply.
I'm just under 5'7" with about a 31.5" bike inseam. The size small has plenty of standover by their numbers but the stack is really low, so low I wondered if it was a mistake at about 20.5". That worries me because im building this partly as a commuter, and the more upright position of the endurance road bikes is what i want.
The size M has a stack which puts it in the ball park of similar bikes. the standover is pretty high at 31" particularly when the seat tube to the top of the top tube is only 18.5", . other bikes with that sort of stack and seat tube have a standover a couple of inches lower.

Can any owners or ex owners comment on whether their geometry numbers are real world or anomalies? particularly anyone who rides a small or medium?

thanks in advance - sorry about the length of the post