Crafty solution needed: Find the bad CVJ!

[Robert M]

    Pretty sure my 4kq has a bad CV joint somewhere, as evidenced by a 
throbbing sound/feeling at 80mph plus.

   Pretty sure it's not a front outer as I get no clacking at full lock in 
either direction.

   Pretty sure it's not either of the propshaft units either, as they felt 
good when I had the propshaft out last fall.  Propshaft u-joint also checked 
good.

   Pretty sure it's not tires, as the problem persists across summers and 
snows, and the summers were new last year and the problem predates the 
tires.

    So.... by my count that leaves 6 CV joints which could be the problem:  
all four rears, and the inner fronts.  Does anyone have any clever tricks 
for finding the bad one(s) without a total teardown?

  Thanks!
Robert