Did you get your driveshaft shortened?
Call up the driveshaft shop. They will build you a 3 1/2 aluminum driveshaft for around $450. This fixed my vibration issues the same ones you are describing. They are 1 of 3 shops in the US that balance the driveshaft high-speed. I have 1/4" slip yoke sticking out now past the t56 magnum dust boot.
I was getting vibration around 50 and it got alot worse 70 plus. Old steel driveshaft was double checked for balance and I couldn't figure it out. I did what unmentioned above and it fixed it. Also ask for the antivibration dampened option.
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