Noticed similar "close together" dimple pattern when I recently installed new tires, but, the pattern was only 4 inches long. I'm running Bontrager latex tubes (green). I thought it might have bunched it that one area?
As a side note, I flatted 1st ride after putting on the new tires, discovered the leak was at the valve area (at the patch that overlays the vale to the tube), ordered a can of the Rema vulcanizing fluid, used a standard patch and the darn thing has been holding up no problem.