No no no no, don't move your right speaker sideways to fix the center image, more it forward in 1/4" increments, or smaller, until the image centers. And I should note put it back where it was first. And take out all the toe in on both speakers while adjusting, toe in is last on the adjustment tree.
The room doesn't seem that asymmetrical, just a corner pushing in behind the speakers. You can go with full on measurement of decay and frequency, but just to experiment you can go slow and try absorption at first reflection point on the side walls. One of two of those clear half round deflection panels in front of the window with still let light in and some reports are that they're the best deflection you can use. Others may have more expert opinions.