I have the exact same problem splits on the inside wall and have had 2 blowouts in 7 months now, been to Audi with it who said I have just been unlucky twice (both front tyres) but it has just happened again and I'm at the end of my tether with it, I'm just back from my local Audi specialist who have said it's not wheel alignment and never really had an answer for me.
i phoned Dunlop to complain last week but was basically fobbed off with an apology.
Dont really know where to turn next with it other than selling the car which I don't want to do, love the car but can't keep going on like this with these tyres.