God must have graced me with long arms, I just remeasured my wingspan (for the umpteenth time) and sure enough 73"(and change depending on what fingers you use) / 2.5= 29.2"
That's on a 5'9" frame .
I've tried 28,28.5,29,29.5 and 29 always feels just right with a short loop (on a bowtech anyways-I'd drop to a 28.5 on a late model mathews).

I'd say your bow was already a 29" draw when you showed up.