My data for you:
Same square setup but on RE71s. PFC08 in front, Hawk HPS 5.0 in rear (I run the rear pads for both street and track to save the extra pad swapping).
In 7 one-day events this season I've been really impressed with the wear rate of both sets of pads. The PFC08 are a remarkable step up in performance from the stock pads!
Front calipers are British racing green
, rears are still blue. Car feels great under braking (tho I'd love some stoptechs one day). I agree with others on here that it doesn't seem right your rears are wearing so quick.
As for the change to DSC Off, wow, what a brilliant change to actually learn and develop slip angle in this car. You simply can't achieve it in the DSC modes, or trailbrake properly - for US LCI at least. Now I'm finally dancing with the car and it's a great feeling to work up to the traction limits and try to keep it right there.
Good luck with your brake thing!