I use comps to 1000hz. After front horn loaded dual 12in cone drivers to 70hz. Then bass horns or 31.5in fostex. I also have many other loudspeaker designs about. I do know its hard to sit close to the large horn rigs unless designed for such. Also that non horn designs can sound wonderful. And I use both. Some of larger horn systems sounded very real but after a hour or so they kind of fatigued ones ear. I at the moment am enjoying a raal ribbon seas x-2 combo sim too pic. But also my front horn system. All I can suggest is that maybe your mid horns too large, drivers covering too much range. Thus tweeters too far from mid horn, thus both too far from mid bass horn, than you more distance needed to integrate. I havent had much luck running comp drivers lower than 800hz. They seem to get shouty and integration problems due to horn size also prop up. YMMV
