Had similar problem on my Camry. Did many of the same things you did. Wound up being my wheel bearings. Here's a link to the DIY thread I made for the rears; Link. And here's the DIY thread for the fronts: Link.
Edit:
Oh, and I doubt tire pressure could have something to do with it. A bad tire, perhaps.
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1992 Camry LE, V6 (3VZ-FE), ABS brakes, 330k miles, dark emerald pearl, owned since new.
1996 Avalon XLS, ABS brakes, moonroof, white, acquired w/ 139k miles, now at 261k.
2001 Yamaha FZ1, Ivan's jet kit, resprung all around, Ohlins in the rear, Race Tech cartridge emulators in the forks, 45k miles.
Last edited by BMR; 11-22-2008 at 06:20 PM.
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