2013 Plug In - Nokian WRG2 - X Pattern Rotation?

We have a 2013 Plug In Base, 79k miles, bought new, fabulous vehicle. The OEM tires wore out last fall, and the Nokian WRG2s we put on, were heading into their 5th winter in Michigan, about 16k miles on the Nokians at that time (now 25k+). It was our intention that it would be their final winter, and then we would either sell them, or use them all year until they were done. I sent the following to our Toyota service advisor, but he did not have an opinion, other than the normal front to rear rotation recommended by Toyota. Your thoughts/recommendation? As always, thank you.

"...Unlike dedicated snow/winter tires, these WRG2s are rated for all year use, if you choose. Of course, we always inflated and rotated the Nokians properly, approx every 5k, following the Prius recommendation of front to back. The last interval was a little longer, 7k.

At the last front to back rotation, there was significantly increased road noise from the Nokians (again, our first non-winter use). Maybe it was because of the longer 7k rotation interval, and being a winter-ish tread pattern. Maybe it's because the tread depth is getting shallower. Or maybe winter-ish tires get louder in warm weather. Certainly, they have more road noise than summer/all season tires, regardless.

After all this explanation, my question is: is it reasonable to experiment with a different rotation pattern, besides the Prius-recommended front to back? The Nokians are assymetrical, so they have to be mounted the right way on the wheel. But once mounted correctly, they can theoretically be rotated to any position on the car.

We could try crossing one set.

Or maybe since they are well into their lifespan, we could experiment with the X-pattern. There may be even more road noise temporarily, but we would like to attempt to get max safe life out of the tires."