I have experiences concerning this tyre only with a 1973 911T. The Dunlop BluResponse. And with this car they work very well. If I had to replace the tyres on a Roadster I would give them a try. Not too expensive and the follow up of a former Porsche certificated Dunlop tyre. Available in 205/65/15.
The 911 certification means among others that the tyre has a durable side wall to cary the rear engine forces. No relation, just a happy customer.
https://www.national.co.uk/tyres/brand/dunlop/sp-sport-bluresponse/
