I had the same concerns going from shooting 66" longbows. I draw 27". I was going to get the 60" thinking I'd be losing stability with any shorter bow. I decided I'd just get the 58" and live with it.
It's a waste of time to worry about it. Once you shoot the Shrew, you will stare at the thing and wonder how it is possible that such a short bow can feel so long. Then your buddy, who has a 29" draw will shoot it. He'll shoot it again, and again. His 62" recurve from a major maker will be ignored while he continues to stare at your bow as you shoot. Later, he'll call and ask if you have to work. When you tell him you do, he'll say something like, "Hey, why don't you drop that Shrew off at the house on your way in so I can shoot it a little."
And so goes the story of the Shrew. My next one will be 54".