Others may have a different view, but I’m thinking you should audition the Niagara before deciding on a power cord upgrade.
I have a Niagara 5000 and it made a remarkable difference in my system - such that it negated much of the benefit of using more expensive power cords. When I auditioned the 5000, the dealer gave me fair warning - every customer who tried it in home also purchased it. For me, it was obvious in the first 30 seconds. I have since auditioned some very well regarded power cords (including AQs), but have found little benefit. Interconnects and speakers cable differences are plainly obvious. Power cables? Not so much anymore.
As I’m sure you know, the upper Niagara units are not current limiting, but actually help in this regard as they “bank” power for supply more current than the wall can provide for short term transients. No downsides to an audition up front that I can see.
Let us know how it goes.
Best,