So I harvested eight broom billets, these being four 30" lengths split into pairs. The billets came from 3 different stems, one side of every sister is knotty, the other not so much, so 4 knotty billets, 4 not quite so knotty billets. Would you choose the best quality billets for a bow and bin the more knotty ones, or pair the sister staves into 4 bows?