joJo, we do have a lot of service berry around here, but it is really hard to find a big enough straight piece. It does twist. However, it is really tough stuff to break, regardless of the grain run-off. It seems hard, polishes up well, etc..
Plum, apple, and hawthorn all twist more, in my experience, and give me more truble.
I have made a couple of shooters from small diameter saplings, where I just chose where I wanted the crown, ignored the grain, and flattened the belly. They were fine, but they were also narrow and low draw-weight (38 and 42 lbs about? +-)
This seems like a good candidate of sinew backing, if the bow is wide and low crown.