when I read about bows the Pope tested,, some seemed to be good quality and some not,, so would think there is a wide range in quality of bows still existing,, and may not be representative of the bows that were used for the most part,, I am just guessing,, but the bows that exist today,, are a very small percentage of how many bows were in existence in the past,, the bend in the handle is a great design,, and will allow for a longer draw with a shorter stave,, makes since it was used alot,, as far as the tiller,,, if it shot well and did not break,, the way it looked was probably secondary,, I am sure there were virtuoso bow makers that could tiller any way they liked as well,,
if the unbraced profile is good,, you can assume the tiller was pretty good,,