You have a really nice system and room BTW. I have no complaint with Wilson really other than the cost.
One more thing to try before throwing cash at the system. If you have the ability to highpass the subs and cut the lows out of the mains it will make a huge difference. Running the subs at around 60hz (right where your bass driver rolls off and the passive radiator picks up) will really elevate the bass (no pun intended) and the whole system.
Subs are just so good these days might as well let them do their thing. At 60hz they will blend well. At 80hz I find I can hear them and at 40hz and less the system as a whole is not near as good. That has been my experience in a few different rooms with the same system.
Anyway, something like the JL Audio CR-1 would add the ability if your system lacks a high-pass. If you end up using a higher crossover you might want to pull the subs a little closer to the mains. If you keep the face of the driver less than 39” away from the front wall you should still be good at 60hz and less for room nodes based on the 1/4 wave.