I bought a pair of custom/DIY speakers several years ago. They have a similar design to Legacy Focus and use Eton metal dome mids and tweeters which are highly detailed and can be BRIGHT! These speakers replaced Von Schweikert VR 4 Gen II and killed them in every way, making the VR's sound veiled and confused but the upper midrange brightness made them a challenge to listen to. I experimented with interconnects and power cords and then tubed components. I tried gold in various locations and found it either dulled the sound or made the already too prominent mids more prominent. Really, I considered selling the DIY speakers due to the brightness issue but I lucked into something that didn't obscure any detail nor did it dull the top end extension.
During my power cord experimentation, I tried various plugs from Iego and Oyaide and then sourced wire from several places. The top of the line Iego 8095, which is rhodium over silver, has a very open and extended top end but somehow tames brightness and the Mundorf silver/gold wire is a great match with these plugs. I got the wire from Ebay , a Taiwanese distributor, and for less than $400, I got the sound I was hoping for. One of these in your system should tame the hotness without reducing the transparency/detail. That's not cheap but it will better a lot of more expensive after market power cords. I had Fusion Audio Enchanters, BMI Hammerhead Gold and Whale Supreme, and 6sons Audio Windigos in my system. I never felt that my DIY cord wasn't better than all mentioned. And the taming effects were noticed in all locations I tried the power cord in. It sounded as good on the digital source as the power amp as the power conditioner/regenerator. Good luck with your quest!