Ok so have decided to give the Seymour Duncan SPB-2 Hot P pickup a try,the Quarter pounder is good but I had the urge to try the Hot, I tried it years ago but I was using flatwounds and it was not a good match but I had the feeling that with the strong mids on this pickup it would make a great rock pickup with rounds and also who doesn't like buying new stuff? so I decided to give it another try.
With rounds I really like this pickup and I think this one might be a keeper, it absolutely nails that Geezer Butler Black Sabbath bass tone, this pickup is strong in the bass and low mids and has rolled off treble response, it is a great rock tone, more dark,growly type of rock tone rather than bright and biting.