I ended up doing what Donny is saying on my car. Instead of cutting the tunnel I got my working angles as small as possible by lowering the pinion angle. I do think it caused an oscillating vibration over 85 on my car. The harmonics are no longer in sequence. It's certainly worth a shot.
If you have adjustable shocks, you could raise the car up as high as possible. That will effectively reduce your working angles and let you know if you are on the right path.
I agree though, 5-6 degrees of working angles is a problem regardless.
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Todd
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