Becarful with shorting input voltage source and that stuff if you want to simulat your Output res. You still need the Bias for your CS stage, to set the right operating point. So set the Bias, that every thing looks right, put a AC Voltage source to the Output (and only to the Output) run an AC simulation and calculat Vout/Iout (both from the AC voltage source), the simulater ignores the DC voltages but it needs the Voltages to get the right small signal paramters