new equipment power conditioner or more powerful amp?

Probably not the direction you’re thinking of but you already have a nice system. Maybe look at dedicated circuits and get some Hubbell Porter Port Outlets sold here, some aftermarket Pangea Power Cords if you’re using the stock cords then if you have anything left, go to the Bluesound website, go to shop/outlet and buy a refurbished Node 2 for $299 with a subscription to Tidal/hifi and enjoy new music.

Thank you the ideas. 

I would add a dedicated line first. It shouldn't cost very much, either.
Bob

To get the best sound from your system you need to:
Get Jim Smith's book Get Better Sound,
Follow the instructions,
Dial-in your setup,
Apply room treatments where necessary,
Enjoy your much-improved sounding system.
The room and setup will contribute AT LEAST half of what you will hear.

Tom

Agree, tweak the system setup and then the room. 

For $1-2k you could buy enough Blue Quantum Fuses, ECTs and HFTs to have your system performing on a level far beyond anything you could get from any new amp on the market. This stuff is seriously transforming, most of it you can try 30 days and return if you don't like it, and best of all you buy it once and use it everywhere forever from then on.