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Darton Paper Tuning Help!!!

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I just set up a Darton Avalanche and am having a very hard time correcting a bad tear. The tear I keep getting is a low tear, the shape of the tear looks like a Trophy Taker Shakey Launcher. The tear I'm talking about is on page 7 of the Easton tuning guide in the top right hand corner. The easton tuning guide says it indicates a high nocking point and I've tried lowering it, but this only puts my arrow at an extreme upward pitch. The only thing it suggests that I didn't try is decreasing the overhang of the arrow from where it makes contact with the rest.
Could my arrow be too long and cause this tear or what?
What else could it be? Is there a trick with Darton Bows?
How long should the overhang be ?
The proshop I'm dealing with doesn't usually work on Dartons...if you have any advice please let me know.

I am shotting a 28 1/2 inch draw length at 65 pounds and I am using carbon express 300's with a 100 grain field point and a release.

Please Help!!!