ya, turkey hunting is a constant learing curve. alot of people are surprised at how tuff it can be to stick a turkey in the wing area.the only tuffer spot would be the breast,ive seen arrows hit right square in the breast and just bouce off.they will penetrate the brest up untill they hit the breast bone and then back they come,doesnt really hurt the bird much.
i have and always will be a head/neck or back shooter on buzzards.
just incase your curios about back shots: if they are struting away just aim for the bung hole,if they are just walking away their wings make a nice guide for where to shoot them in the back,just aim right between the wings and you should bust the spine.
sorry to hear that you didnt get your bird,jut remember they are a self renewable resource and there will always be another day and another shot.
i think that you may of had better luck with a nice sharp steel broadhead for a wing shot, i know its not quit primitve but problaby would of had better luck.jmho