about the photo,, the camera distorts images a bit,, and the cant of the bow comes into play,,
when i hold up a straight edge to the photo,, i can see the tiller pretty good,,, and if it was my bow I would be hesitant to make adjustments made soley on the photo,, i would have to see it in person,, and study it like that,, also I would have to study the unbraced profile and the feathering of the grain,, etc etc, etc,,,,, the photo give a good general idea,, but I would not scrape wood based on it,,
if the bow was not taking any more set,,, and teh profile was stable, I would make that my key indicator,, and how the bow shoots trumps all that for me,,