Re: LNA post layout
Try to locate wither it's a Layout problem or parasitic modeling problem...
For example, run the extraction for the inductor alone, and check wither Q and L are equal to that given from schematic. repeat for other elements "RF transistor, Capacitors, etc."
It's possible also that you have double counted parasitics. "parasitics included in the RF models are re-extracted by the extraction tool..." I has similar experience with calibre once...