So after 3 punctures since I bought the car in October I now need to change another tyre due to wear. (wife needs 2 more tyres and son got a puncture two weeks ago)

I have Pilot SS on the fronts and still have the Dunlop Sport Maxx GT's on the rear from when I bought it. It is one of the rear's that needs changing so my question is - Do I stick another Dunlop on the rear to match the axle or put another PSS on? The final Dunlop has 4.5mm tread left. I absolutely hate the Dunlop's as the grip is shocking but I obviously don't want to mix axles.
Thoughts please??