125hz-134hz Null - Help please!

Update: Stopped working on the studio as I ordered some ATC scm100asl's! I thought I'd be able to move the treatment out of the room, but it would be really difficult. I'm just going to wait until I get the new speakers and go from there. Depending on the results, if I end up wanting to soffit mount, it may be time to hire a local professional to come build it out for me. I've read the guides on here for soffit mounting, but I'm not 100% confident and don't want to screw it up. I'm open to any suggestions/recommendations.