I would think the wingspan method would be more accurate since it takes into account your actual arms length and not how big your head is or isn't

. My wingspan places my draw at 29.4", body height= 27.6". I shoot a 29" just fine, I've tried 28 & 28.5 and felt too "bunched up", 29.5 felt too long.
If you are going to try to limp by with this bow for this year (not that I'm advising that) you might consider shooting off the string (ditch the loop)and aquiring one of those new releases that have trigger placed more forward to try andfudge the draw length some. Scott and Tru-ball are selling them. The Tru-ball Xtra series look mighty good to me.