Alan and others,
Can't tell from the pic, but if the odd number side plug wires are similarly bunched......it would be better to be sure that 5 and 7 DO NOT run parallel and bunched together (should be separated at least a couple of inches). An odd thing called inductive coupling occurs and can encourage cross firing and you would not hear it but power would suffer a bit.
Yeah, I know that is not the kind of stuff one hears on forums and such unless it is underlined with "some guy said" but it is a technical truth that is worthwhile to know.
Where did you dyno test your engine? They should have known this item from their own testing and trouble shooting.
Regards,
HB2
Dissident