I've been experimenting a little with my form, with some success and some frustrations..I've had a little target panic creep in this past year.
A couple of surprises, one is my draw length with no draw check is 26", and 26 1/2 with a draw check like a clicker. I thought it was longer but I use a measuring arrow with a clothespin, and that's what I come up with. I'm 5'10" and I guess that's about right when considering Howard's was shorter than expected and he was a big dude. I can draw farther, but the string is contacting my body and I consider that over drawing.
I remember another tradganger posting something similar, but to get a 28" plus draw with a Hill bow, I would guess you would need long arms or be quite tall..