Nice pics! Those must have been new. My rears have no where near enough tread after 3 track days to run in the rain.305/325 MPS Cup2 in the rain at 125mph no problems. 1.3 g turns in the dry no problem.
The reason your rears are wearing so fast is you're getting into the throttle to hard causing them to slip...try a taller gear coming out of the corners and press the gas pedal like you had an egg under your foot. And do this as soon as you come off the brake. Same thing on your fronts, pushing the car to hard with the throttle causes the tire slip angle to exceed design.Nice pics! Those must have been new. My rears have no where near enough tread after 3 track days to run in the rain.