Trey, my driveshaft is same way, higher at the rear than the front. A lot of guys with lowered vehicles are in the same boat...with no vibrations.
Driveshaft angle is irrelevant. You should see the angle of my brothers rear shaft on his 87’ truck. 17” of lift. It’s steep, and there’s no vibrations with 44” Boggers.
Engine/trans combo should be 2-3 degrees down. Even 4 is ok, I’ve done it. The trick is your rear must be up the same, whatever it is. These angles are also irrelevant of frame/chassis angle. Measure against shop floor, not chassis.
Are you using shims under the rear end to adjust angle? I’ve seen these shims not be exactly the same, and cause binding on the rear end housing when the u-bolts were torqued down tight. Angled lowering blocks can be the same way.
I know you’ve been all over this for too long now. Let’s hope the driveshaft change fixes it. DONT TORCH THE CAR!!!!
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