I cant comment much on the tiller as it looks a little different from pic to pic. What I can offer is a way for you to check it. While braced, take measurements along one limb at some intervals (every 4-5 inches as an example). Now compare those measurements to the same locations on the other limb while braced. Bottom limb for me will typically be a tad stiffer than the top. With that information adjust as needed until the measurements are the same (or close). Lastly, check the bend with a straight edge while braced and while drawn to say 15 inches. The gap will tell the story.