Slight gas pedal vibration at high speed

Hello, I have an 06 Acura TL with 164k miles. Recently I have been feeling a slight vibration at the pedal only between 60 to 80mph. Car wheels have been balanced (hunter road force) and aligned. Some more info that might help with this but not sure if related. Car also has aftermarket motor mounts, I do have a vibration at idle but I dont mind it but not sure if it is related. Any help or routing me in the right direction would be much appreciated. Thanks...

edit: Axles are stock original but visually seem fine. I do have warped warped rotors which I am aware of but again not sure if this can be related.