You're making the classic mistake of squashing the circle to fit the tiller shape, instead of adjusting the tiller to match a circle. You can use an ellipse instead of a circle depending on your final goal, but don't force a shape to fit a bad tiller.
At the moment, you've got hinges in both midlimbs, and the tips are way too stiff. The middle is bending unevenly, which is why it's leaning to one side. If you get that braced to a full brace height you're going to make the bow fold up midlimb, and it will probably fail again. Work on the middle section to relieve stress in those two hinges and then get it to brace height to see what the tips are doing.
Use a full circle (or slight ellipse) and scale it up or down to fit the tiller shape, instead of squashing it until it sort of looks right.