First..thank you gslx4s and OffTheBeatenPath for your continued assistance. As the wheels have been rebalanced...and I am assuming that they do know what they're doing here...the problem is obviously not a simple 'fix'. Ditto with an alignment (not to OffTheBeatenPath...this was done to Lexus LX470 specs and they did not give me the 'numbers').
Though the tremor does yet exist, it is vastly improved. Not perfect, but I'm beginning to think that they just think I'm 'too picky' and that that is the way this SUV handles. As mentioned, I did drive another LX470 off the new car lot and that one, too an sadly, had the same 'flutter' in the wheel. And, seriously, the flutter/tremor/shake is not horrible, but annoying for this quality, luxury SUV.
To respond to OffTheBeatenPath...
I don't know if they tried the front to back tire rotation. As for when this happens...it does NOT happen while driving at slower speeds. It is most apparent in the 65 mph range and does seem to be enhanced on different road surfaces. Quite honestly, I can't tell you the difference between asphalt, blacktop, concrete, or a combo surface. The AVS is centered, pointing to the front of the car...and I believe the Lexus person was with Customer Service and not a Master Tech.
I have not contacted the dealer since the alignment but intend to contact Lexus directly again and request that a Master Tech, if that is not who drove the car, drive it. I had been told when I first got the car that this was 'inherent' and would work itself out with mileage (can you believe THAT !?!)...and I've been hoping that that would be the case at this point (not!).
All of this has just taken way too much time and energy and I'm almost...not quite!...ready to just let go of the issue...which is, I think, what Lexus is hoping for. We shall see and I will keep you posted.
Thanks again AND certainly, if you have any thoughts, please let me know....