I make my arrows 27.5" from the inside of the nock to the begining of the pile - but when shooting without a rest I am drawing the arrow until I feel the edge of the pile on my bow hand first finger which is of course in front of the bow so 27" max measured to the bow back. With a recurve and arrow rest I draw a bit more. If I draw any further it leads to straightening my bow arm too much or my string hand being pushed outwards away from my face on loosing and then it all goes wrong! For roving marks and flight shooting I can draw 29.5" but this is a wholly different technique.
Thanks for the survey I agree with the findings - most of us don't draw 28" with a primitive bow.
Stan