There are two things I can offer as a suggestion. One, we can measure your speakers with LMS and/or the Smith & Larson system to see what's happening. Two, we can put my four π's in place and A/B them against yours. Your speakers and mine are similar except tweeters. Mine has uniform directivity and yours has collapsing directivity, so we can see what difference that makes in your house. The differences should be most pronounced between 1kHz and 3kHz and then again above 5kHz.