PS Audio AC-5 question

I recently bought PS Audio AC-5 power cord for my Parasound HCA-1205A amp. My pre is Anthem AVM-20 with Shunyata Diamondback power cord. My speakers are Paradigm Studio 60 v.3. When I changed the power cord of the amp from stock cable, I found that the overall sound is more forward than I would like. Also the top end has opened up, but I feel it to be a bit harsh - to the face. Not sure what is the issue. Is the PS Audio AC-5 a worng choice to Parasound amp?.
I have got a real good deal on AC-10 on craiglist here. Is there any way I can check if the cord is not fake???.
Music Direct is still doing the 50% off deal. Is the
deal better than this. I just bought an AC-5

No affiliation with them.
Not really, PsAudio has taken steps to stop some ebay fakes, but I would trust my gut on this one, how much is it?