IMHO you are chasing a ghost .

There's nothing wrong with the numbers. Mainly because discrepancies in the test can make a huge difference in numbers even on a good engine.

Was the motor up to temp?
What was the battery state?
(on a newer application)Were the injectors disabled or not on to prevent fuel washing?
Were all plugs out at the same time?
Was the throttle at wot?
How fesh is the motor?(rings might not be fully seated yet)

That's why the factory specs are so vague. As long as the engine is running properly, it's all good.