Yes, I have. I actually used to run all Hubbell outlets and Hubbell 20A male plugs for all my home theater equipment. I was experimenting with power connectors on my separate computer audio system and put in a Wattgate male plug. All of a sudden, I said "hey, this sounds just like sound I’m getting out of my theater". It was not a good sound - it was very fast, but very shouty and sterile. Just a single Wattgate plug in the mix caused this problem (I had 4 devices - DAC, preamp, 2 studio monitors). The Wattgate connectors and the Hubbell connectors/outlets all have one thing in common - brass conductors. I have since swapped out all my Hubbell outlets/plugs with Furutech FPX unplated copper outlets and Furutech FI-11 unplated copper male plugs. I use all Rhodium plated Furutech FI-52 and FI-50 IEC connectors for my equipment. All this was a significant improvement.
I have put more comments in this thread:
https://forum.audiogon.com/discussions/furutech-vs-neotech-gold-plated-schuko-sound-quality
Don’t get me wrong, at $20-24 per plug, the Wattgate are "decent" plugs, but they do not compare at all to the Furutech pure-copper stuff. Since your considering several thousand for a power conditioner, a $70 FPX(Cu) outlet is not any big expense and I would say it will significantly improve things.
Be aware, the rhodium plated stuff require 250 hours burn-in. And they don't fully open up until somewhere between 300-400 hours.