I had the exact same problem with a whisker biscuit set-up. I had a 0.5-.75 inch tail high tear that I could not eliminate. I spent days shooting through reams of paper.

I had to move the biscuit in the opposite direction of 'normal' as defined by the Easton Tuning Guide. The Easton TuningGuide mentions this remedy in small footnote that I had not noticed previously.

Here's the paragraph:
[align=left]For archers using release aids, it may, in some cases, be[/align][align=left]necessary to apply adjustments opposite from those[/align][align=left]described. The type of arrow rest and release aid[/align][align=left]combination used can alter the dynamic flex of the arrow[/align][align=left]to produce tear patterns contrary to those indicated[/align][align=left](although it is uncommon).[/align]
This is the tear that I had. Imoved the biscuit down - worked instantly.