Why is LTSpice Bode plot disagreeing with a linear plot?
LTspice always uses db(1V) for the y-axis of the ac simulation results. So, since you actually used 0.01V as the input signal amplitude the actual gain of the circuit is 100 times greater than the output dB value. If you converted -16.4dB to a gain of 0.15 and you expected a gain of 15 then your simulation is actually spot on.