RE: Finding your proper draw length
I just hope "the shop" is credible. There are so many archery stores out there and very few that aretruly PRO Shops.
It is not uncommon for someone of your height to be 29" DL. More narrow shoulders on a tall frame will yield this. I'm only 5'10" and I've got a 29 1/2" DL; but, I've got very wide shoulders which contribute to this. The WS method is only a guide because length of fingers and preferred shooting form can add or substract from the formula.
Good luck in your quest and enjoy the sport.