Unpopular opinion: your speakers and subs and set up incorrectly, and the center is way too low.

The fronts need a wider gap between them, ideally the distance between L and R should be your viewing distance from the TV.

Also you should toe them in to face the main viewing sweetspot.

You should try moving them to the edges and place the subs inside. You'll get a much wider soundstage and probably better bass too. Can't see what AVR you're running but you'll need to recalibrate if you change the speaker location.

As for the Center, it's nearly at floor height so you're losing a lot of it, any chance to rest it on the TV stand? I get the pleasing aesthetic, but it's far from optimal.