I'm glad you are happy with your DMUK work Stephen, Are you on commission? Seriously though, its certainly sounds as though your brakes needed attention.
Out of all the DeLorean's I have owned, if everything is set up and working properly I have always found them to be quite adequate for normal driving. I remember particularly driving , what is now Darren Cunningham car. The brakes were absolutely spot on, Quick stopping in straight line, even the hand brake would lock up both back wheels at speed. I think it's often down the little mileage many of these cars do, things start to sick, rust up etc and hey presto the brakes gradually get worse.