Jolly Rogers the largest cut is the best. But in saying that you can still use your deer setup without changing anything. I would add something to stop the arrow in the turkey, this hits the turkey with all of the KE of the arrow. There are many ways of doing this, washers, o-rings, elastics, ect. I would not recomend any of the above mentioned. What I use is the Zwickey Scorpio which sits on the arrow shaft just behind the head. It does not effect the arrow flight but stops the arrow from passing through. What happens is that the wire fingers grip the bird on entry then applies friction to the shaft (as it slides back) to stop the arrow. You can buy these to fit your arrow size.

I truely believe that these are fabulous and all turkey hunters (bow) should use them. They do help in quicker recovery of the birds.