Pwr. conditioner necessary w/dedicated AC lines?

OK guys, now I'm REALLY confused. I have been using a PS Audio P300 (all of the latest revisions) as a mainstay in my system for about four years now. It seemed to always work wonders in a previous set-up, in a different house/room, which DID NOT have dedicated AC lines.

Fast forward to the present were I now have the good fortune of having a dedicated room with independent AC runs throughout. I have been using the P300 for the last 3 yrs. or so in this room. Well, on a lark, I thought I would try to run my tube CD player (Droplet) direct to the AC instead of through my power plant (which was set BTW on "tube") and WHA-LA! It sounds a LOT better! ?? What's up with this???
The dynamics spang to life and there is better extension in the top end. Again..what gives here???

The possibly scary part of this whole scenario is - what if I have been "chasing my goofy audiophile tail", all this time, swapping, changing, selling and buying gear based on an erroneous negative sound effect that was possibly brought on by my Pwr. Plant on my front-end gear?!? Arrgh!

Just to be sure that this was not a fluke isolated to my Droplet, I also tried a different CD player that I have on loan and the same effects applied (sounded better "straight" into the wall AC).

Can anyone else relate a similar effect? Advice?? Comments??? Thanks.