I just sent you a PM. I have a V6 that has this same vibe that has steadily gotten worse over the last 5K miles. I've replaced CV, U-joint, Hub/bearing, full tranny service/fluid exchange, shudder additive (didn't need it, but tried it too), special Toyota wheel balancing using the lug centric tool, checked calipers. Came across a post that referenced the needle bearing in the driver's side. Known problem affecting 05 and up including brand new 5th gens that have had the needle bearing and/or entire front diff replaced (sometimes multiple times) under warranty. Also a problem on FJC and Tacos. Same diff on the V6. I'm ordering a brass bushing to fix the problem and hoping the needles didn't do too much damage to the front diff. You can check it by putting it in 4wd and seeing if it changes the vibe at all (looks like yours goes away). It did for mine, but didn't totally eliminate it, so I suspect diff damage. Heres the link:
TOYOTA 8" CLAMSHELL CV AXLE BUSHING
The V8s with similar symptoms usually have a bad U-joint(s) on the front drive shaft.