RE: Spine???????
There is nothing you can do to the 500's to make them work. You'd have to lower your draw weight to 47 lbs (not possible with your bow), shoot a 85 grain tip and add wraps to your arrows to make the 500's correctly spine for your bowwith 27" arrow.
I'd return them to the shop and tell the guy to give you the correct arrows. Since he's the guy that told you they were what you needed.