Yep, same thing for me. I'm 6', wide shoulders and monkey arms (76.5" span). I draw a hill style to 31". My r/d bows to 31.5".
With my r/d bows, all of which are 55#@28" (62-64#@31")I end up shooting the AD Hammerhead with the stock insert and anywhere from a 125 to a 200 grain head. They are a forgiving shaft, and give me the weight I want. I can get some other shafts to fly well, but they just end up being too light.
My favorite Hill is 45#@29" (51@31). It shoots a 65-70 surewood, with a 125 grain point like a laser. And pretty hard, too. I have a couple of 80@31 hill styles, but it's hard to find wood arrows for them (need 105 spine). I need to build some more hickory shafts for them.
The problem with having bowshops give you the wrong spine and length isn't exclusive to long draw guys. I have a buddy who has a 27" draw, which is up from the 25" he had before I showed him a more correct anchor point. He went to an archery store in New Mexico, and they sold him some GT 3555s cut to 27", with the stock insert and 100 grain tips. Those arrows spined out around 90#. He was shooting a 55@28 bow, and not even pulling it to 50#.
He asked me to help him tune his bow. I watched him shoot and he couldn't keep his arrows in a 2 foot circle at 15 yards and his bow was incredibly loud. I took a look at his arrows and thought, there's no way these are right. I screwed on some 225 grain tips, changed his form and grip a little, and, bingo, nice little 6" groups. He was thrilled.
He couldn't believe that an archery shop would have sold him something so far off.