Exactly. Placement is king. For speakers and subs. Those placement changes also alter how the speakers and subs interact with each other and the room AND the listening position. If idling the crawl, make sure to turn off ypao. Once you’ve found the best spot, then run the cal. And as
@Pogre said, speaker placement is very important.
Being on concrete myself and in a large room as well, I am confident that if you spend the time to move things around and recalibrate you’ll have better results.
Also, I still recommend a new sub even after finding a good spot, for it and the speakers. That poor little sunfire doesn’t even have a chance in that big of space.