When I first viewed the thread I guess the pic didn't load timely, didn't think there was one until I just posted (and deleted) asking for a pic
Now that I see it....can you move speakers inside the cabinet using
a mount like this ? Get a little better separation that way. If it must touch maybe the cabinet and use something like a piece of weatherstripping at the contact point? I wouldn't particularly be concerned with them in contact, tho, but would prefer better placement overall for the speakers outside the constraints of a cabinet like that.