Typical for a worn out or defective template rack...3-4 balls will come out almost paralell and end up clustered. It really has to be either poorly designed or shot to hell before this starts happening, but I HAVE seen it happen with ancient template racks. I even had it happen to me for a couple of days, until I replaced the rack.
Buy a new one, an original Magic rack. If you can't get a good break with a rack like that (the magic rack "loads" the balls), then you are beyond hope. You allready replaced the best table ever made, a GC4, with a Diamond table because you didn't like the result of your breaks, what is a few bucks for a piece of plastic? Better still you could check if all your balls are the same size and weight, better get new ones, just to be sure. Then buy a new house just for the heck of it.