If you want to try a different power cord I would suggest the Cerious Technologies Matrix Power Cord. I've been impressed with this power cord and I've talked with several audiophiles the report very good results using it on ARC products. There is a trial period (see the website for details) and it could be returned for a refund if you are not happy with it.
Perhaps you could demo a few power cords at the same time that have a return policy, then all you need to be conserded about is the break-in time.
Perhaps you could demo a few power cords at the same time that have a return policy, then all you need to be conserded about is the break-in time.