Violent Take-Off Shudder

Did you make the transmission centerline parallel to the pinion centerline at rest?

No. I had my pinion CL 4 degrees below the engine/transmission centerline at rest. I figured for 4 degrees of axle wrap during acceleration. My issues came from having the engine/trans centerline 0 degrees with the drive shaft. For some reason, my clutch did NOT agree with that. I shimmed the transmission up and all my issues are gone. Once I install the "pretty" shim, I will reset my pinion angle back to the 4 degrees below engine/transmission centerline and readjust my snubber location.