nautilus 801 soundstage accuracy

I've been trying to get 801's working properly for a while now. The bass has been a diffucult but is coming along after building many bass traps and insulating the ceiling and bulk heads and covering it with fabric. I'm also waiting for a new solid state pre amp wich I think will help.
My question now is how important is the correct tightness of the slotted tension tube at the back of the midrange unit to reveal the correct midrange and soundstage.. Joel