I've never seen HHB stwist when it grows. But I've only cut 3 trees in my life. It will swarp if you split your staves to small.
If the trees 2, 2 1/2 inchs is makes a far better bow if you use the whole stave instead of spliting and trying to get a couple bows. If bigger I 'll let them grow to 5 or 6 inchs where I can split staves from it.