It’s hard to say, because every situation is unique, so what worked well in one setup is likely to work out differently in another. Most AVRs aren’t ideal for bi-amping, but you never know til you try. All you need is another set of wires, and it’s easily reversible. Low risk, low cost.
Trying stuff is good IMO! It’s hands on and is a great way to learn. 😎
(Do you know if anyone has tried a crossover parts upgrade to those Polks? Improved clarity can certainly help improve the soundstage.)