I have not seen a schematic of either conditioner so I am just speculating or taking a WAG. Sometimes in the world of audio less is more. I am not a big fan of adding equipment into a system unless there is a need for it. The purpose of a line conditioner is to filter EMI/RFI and protect your equipment from those little nasties called surges and spikes. Why add an EMI/RFI filter if you do not have an EMI or RFI problem? If there is no problem the conditioner will certainly do nothing to enhance the sound. Equipment protection though is a valid concearn. There are other ways to protect our equipment besides using a power conditioner. I personally do not use surge supression because I do not want to trust my equipment to anything but myself. I simply unplug my equipment during a thunderstorm and during the summer where we may experience a power outage and surge when power comes back, I use a high power relay to control all power to my system. If I lose power I need to reset the relay when power comes back so my system can get power again. Anyway. It is possible that the extra filtering etc. is having an effect on your system and adding coloration.
Thanks for letting me hop up on my soap box.
Thanks for letting me hop up on my soap box.