Keep in mind that what MA 1 is showing you here is only a prediction of the post-alignment response. You would need to take in-room measurements yourself to see what's really going on.
That said, are you able to provide the "before" measurements? You're clearly dealing with a large null below 40Hz. You could attempt to dial in a filter or two to boost that area a bit and see how it sounds / measures. Do you have any flexibility in the placement of the KH 750? Neumann recommends pushing it as close to the front wall as possible and this is what worked best for me. I was surprised at how sensitive to placement it was and even small adjustments of a couple inches made a large difference.