Got the used $40 cv axle I ordered off of ebay, to test my theory. I'm gonna swap this out for the one in my X now, to see if it resolves the acceleration vibration. The one in my X has got some play in the cv joint, the used one I bought doesn't. If it does resolve it, I'll drive it for awhile to see if it reappears, because a separate issue (transfer case)? Once I get it all figured out, I'll get some new oem axles, once I know they won't get ruined by an under-lying issue...

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__________________
Current-

--2003 X5 4.6
Estoril Blue
Black Nappa leather
rear air bags
OEM nav
OEM hitch
OEM cargo liner
Black housing SPYDER headlights - Evo-XR projectors

2017 GMC Sierra, 7K miles...
2017 GMC Sierra, 60K miles...
2015 GMC Sierra 280K miles...
2011 GMC Sierra, 500K miles...

Previous wheels:

--First love~
1969 Chevy C10, 396BB bored, 3 on the tree, Black ~SOLD~

--2011 Chevy Silverado LT 2500HD CCSB, Black, 250K miles ~SOLD~