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Sorry you didn't figure the issue out but I still believe all instances of this (in any car) can be traced to the driver. "No production car's engines can overcome their braking system." This is an absolute (and the basis of dragster starts for fastest 1/4 mile times)!

Several Toyota models (e.g. Highlander, Sienna) used the same brake system that the 2010-2015 Lexus RX used - rotors, pads, everything. I don't remember about the RX but I do remember there being a service campaign that addressed brake disc warping and vibration on the generation 3 Sienna. I have a 2014 Sienna but mine never developed the problems. I did modify components under the vehicle that directed brake cooling airflow per the service bulletin "just in case". I've wondered why I've never had the problems reported by many others especially since my Sienna Limited is heavier than any Highlander or RX and likely stresses the brakes more. One reason might be because I've paid extremely close attention to lug nut torque. Uneven and/or over torquing lug nuts is a known common cause of brake rotor warping. The correct lug nut torque on the RX, Highlander, Sienna and most other vehicles manufactured by Toyota is only 76 ft. lbs. An air wrench should never be used to tighten these lug nuts and they should always be tightened with a manual torque wrench. I've had both Lexus and Toyota dealers tighten lug nuts to over 200 ft. lbs. on too many occasions. One service manager swore that his mechanics never used air wrenches on lug nuts but I then watched as one of his mechanics had to use an air wrench to remove the lug nuts that one of his mechanics had just over-tightened. I've learned to always check lug nut torque with my own torque wrench after someone else messes with my wheels. If I hadn't done that, I wouldn't have been able to change a flat tire on one trip. So ... my 2014 Sienna that has the same brake system as the 2012 RX and is on the original brake rotors and pads front and back at 94,xxx miles. Based on the wear rate, I'll have the original front and rear pads replaced at the same time and the original rotors turned at a little over 110,000 miles when the pads will by then be worn down to the 1 mm minimum specification. Yes, only 1 millimeter of pad thickness is the minimum specification for most Lexus and Toyota vehicles. 1 mm looks scary to the uninformed which is why so many people get scammed into premature brake work. On Lexus vehicles that have electronic brake pad were sensors, the low pad warning in the instrument cluster starts when a brake pad is worn down to about 1.5 mm. My recommendation is to buy a torque wrench if you don't already have one and check and re-torque lug nuts after each time someone removes and re-installs your wheels.