Thanks Jake - It's a long time since I used it - and remember it as really fun and inspiring in the past and like the look of their SSL 9000k mixer emulation (I like what I have but it's a nice thing to have too).
For most things piano related, maybe their MClass Mastering Suite might be worth a try.
Mainly because that has a simple split low/high band stereo imager tool (along with other tools).
With that you can quickly pinch bass in (towards mono) to solve some flab/phasing and keep higher frequencies generally tidy or wider. I really love other mastering tools with more bands, shelves and bell curves, analog/digital emulation + different mode etc. but that might be quick and simple for that kind of thing.
Pianoteq Studio Bundle (Pro plus all instruments) - Kawai MP11 digital piano - Yamaha HS8 monitors