tracker 12,
My set up is 500 spine, 30.75" long. 250gr head, with 3 X 5.75" banana feathers.
I shoot this out of a 43lb A&H longbow.
Honestly, this setup bares shafts terrible! Consistently shows that this is too week. For perfect bare shaft flight I should use a 175gr head. However, with the big feathers it flies absolutely beautiful and I like the extra weight on the front.
I do a lot of 40-60 yard shooting in the backyard, and they flew just as true as arrows that are perfectly bare shaft tuned.
Hope this helps!
chris <><