Dan, your bow is a good example of why the tillering tree is referred to as the "lying tree". With how your gripping the bow and how you're tillering using your tree, there's no way you can account for the bow hand pressure being exerted on the lower limb. I'm not sure where you placed your arrow pass, but what I see from how you're gripping your bow, 1 1/2"-2" above center would be appropriate.
Next time you try this design, get your regular string on early, tiller per design, and feel for even limb strain as you draw the bow (yes, by hand). Use a mirror often to adjust tiller if need be. Way I do things.............Art B