Using Create v0.3.2f in the Create: above and beyond mod pack, I made the rotational harvester shown in the image below. For some reason it only harvests about half of the sweet berry bushes. The other half is ignored/never harvested, despite the harvester going straight through them.

Apparently this is a vanilla mechanic. Sweet berry's have two stages in which they are harvestable. A some-berries state, which yields 1-2 berries and a full-berry state that yields 2-3. Create only harvests the berries when in this second (final) state.