Focal Diablo / Utopia III breakin really long?

I've purchased a new pair of Focal Diablos. When the speakers were first installed for a day or so they were good though the midland and up had a pretty coherent image. After the first few days they really lost some life, weird. I was warned that this would occur and the magic would reappear after break in but I didnt really expect this. This pair now has around 300 hrs on them. I don't know how many music hours it will take for them to break in and open up. Any Diablo or other Utopia series III owners out there that have experienced this?