Thicker rotors from the Tundra, not bigger. I have the rotor and caliper upgrade made by Brian Jowett on my 2011. I have not had overcooked rotors since upgrading 100k ago.In Texas under high temps and humidity conditions similar to Florida I have zero problems with Toyota parts on my 24k miles LC200. Granted it is the 2021 (believe 2016+ has bigger rotors/brakes).
Overall, are you sure you have used legit Toyota rotors and pads?