I had one break also as I documented in
my log. That's an inescapable problem due to the tightly curved pieces being cut out of straight wood. You will inevitably have grain going across a narrow piece. Wetting the wood
might help, but more than likely it would probably just soften it more, making it actually easier to break.
One of the things that helped me was to make sure the strake was going to fit properly. Then, just put glue on the first inch or two at the stem end. Glue and carefully clamp it, making sure that the strake is positioned correctly and not under too much pressure. Let it set up. That will help to strengthen it and then, using a toothpick or fine-tipped applicator, put glue on the frames and along the edge of the strake below it, then finish clamping it.