Had the same problem with the Conti on the TR-G back one squared off in only 5000 km ?
Managed to get to the UK with 12.000 km covered but the back was very much on it's last legs.

Fitted the Michelin road pilot 4 GT lasted 24.000km back and nearly 30.000 km from the front.

Need to start a CF 650 TR lemon thread Phill lol

By the way what pressure are you putting in the tyres.