Coppa slip will increase the effective toeque so the wrench should be set lower. But Ive no idea how much lower.
As these do not all need to be accurately matched like engine bolts it makes more sense to do it by hand until you feel the threads go tight. Then stop. Any more and they will go loose again. It not difficult just common sense and dont be brutal with the spanner. Does anyone need a torque wrench for a bottle top?