Since I have the same amp I suggest a Synergistic Research power cable. If you have not upgraded the A/C outlet I would do that first and also the fuse to your amp. With Synergistic Research you can audition the fuse and A/c outlet and if not happy send them back.
Either The Cable Company or High End Electronics can ship to you and both are good about Synergistic Research product returns.
Either The Cable Company or High End Electronics can ship to you and both are good about Synergistic Research product returns.