Having started with the left limb stiff, I over compensated and it was then a tad weak, but I was easing off the right limb and teasing it back.
I'd got it to about 40# at 23" when it went bang, failing a big knobbly knot, hardly surprising. Just a bit of fun trying out a new wood.
The wood is OK, it's the regular big knobbly knots that are problematic as they are rather pithy and weak on the belly and are a weak point on the back.
Pics sow the break, note the filled knot on the belly, it was a large porous area of bark like material.
The tiller wasn't too bad, the grip could have flexed more and the right limb was still a tad stiff.
Here's the video of it going bang :)