Purist Audio Break In - Venustas

Need some info on fellow users of PAD Venustas. I used the Cable Co's library to review the Venustas and loved it. Just got my new Venustas in today and plugged them up and they are decided bright sounding. I know the cables need breaking in, but can someone tell me if the brightness is normal? The only difference between my set and the library set is mine is 3.5m long and the libraries was 2m long.