Tail / Driveshaft Angle..???

OK..........It appears that my pinion angle is good (as mech's have said before).........but at standstill, I have about 2 degrees downward angle of the driveshaft (or a hair less)...........not much.........I'm wondering if that's about right......pinion angle illustrations don't really answer it.........

Now, it seems to me that under acceleration, the line would be nice and straight.....(which is optimal).....or MAYBE just a tiny bit out at the tailshaft / yoke connection..........

Now, please tell me how this would cause a vibration in that area at a "cruise" on your gas pedal (zero pressure torque).............??

Just makes no sense to me..........this is what yet another trans man has told me..........and again, they're talking a couple to few hundred bucks more to raise the tranny tail a bit and correct the problem.............Just seems like more hit and miss........problem is that they use my cash for the target practice.........