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?.
Are you guys using the Power cords with or without the ground pin? I've been breaking the AC-5 in with the ground pin, I'll remove it later to see if it makes a difference.
I have mine plugged into a Duet.
Vinylvin, Iam burining-in AC-5 with ground and AC-10 without ground pin, as it is connected to Parasound known for the ground hum, hum was gone as I removed the ground pin. Iam not sure though if this pin will affect the burn-in process.
Hi Vinylvin, I only remove the ground out of nessesity, I had ground loop hum from my Halo A21 and Anthem, which I'am happy to report is gone! I mean dead quite. I recieved a pair of Morrow Audio's Ma3 balanced Ic's today. In the past before Ps Audio's cables I used cheater plugs and hated the very thought of it.And i know it's dangerouse to lift the ground.Today I put the Ground pin back an no Hum, and Lake( if your reading this) the sound from balanced is Outstanding over rca from the Anthem.Back to the ground lift from the Duet I would'nt recommend it,my Quintet is grounded, Now if its a 2 prong device like my preamp or bluray player I take the ground pins off. BTW how's the burn in comming along?
I can't lift the ground from the Duet, I use a Signal Cable Magic power cord. I use th AC-5 for my Marantz SA-8001 SACD/CD player.

As far as burning in it's hard to tell I changed speakers (Totem Hawks from Polk LSi15s)& speaker wire at the same time. Sounded great right from the start. Right now I only have about 10 hrs on the AC-5, the Totems are broken in, I bought then here, local. Click on my system if you'd like.
Congrats on the Totem Hawks! I made that same mistake last year when I brought a new amp ,speakers and cables I installed all the cables at once (lol) like a stew! Instead of one at a time to evaluate the improvement of each piece. With power I slowed it down to listen to what each change was adding or taking away Soloist Premier, Quintet and Power port premier then foucused on the Cables!