So I would get marginally better performance without the antenna??
I’m no radio engineer but I doubt there’s a meaningful difference between those two numbers.
Most devices that take measurements aren’t capable of returning the exact same value every time they take a measurement.
All measurements have a margin of error.
Very expensive and carefully calibrated devices can have an extremely small margin of error when taking a measurement, but even then it’s still present.
ETA: also I believe the z-wave antenna test expects you to physically disconnect the antenna yourself in between rounds one and two of the test.
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Ahh, of course! D'oh!
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Yes indeed! 
Plus it will be wise to use a 50ohm termination cup. This is low power transmitter but transmitters do not like to be unloaded. The reflacrion from the undermined antenna connector potentially could even damage electronics. But in this case the power is low ...
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