Did you use a tone control when you set the bass for +6? Don't use virtual onscreen sliders, or they will turn Audyssey off. Make sure the Audyssey light is still on when you have finished all adjustments.
Audyssey and other auto-EQs try to remove room peaks, and many people get used to peaky bass, and value it. IMO, the solution is to replace the peaky bass with a gradual, but smooth, bass rise, so that the bottom end of the curve is higher than the top. Some research (Harmon?) has indicated that most people like the bottom of the bass to be 10 dB higher than the top of the treble, and they perceive it as "flat," even though it's not. I achieved that here by running Audyssey, then turning up the sub by a few dB, and also using a tone control (not a virtual slider) to boost the LF and RF bass by 6 dB.
As far as the plane landing, etc., if you decide to use a "sub out" to feed a sub, a great deal of the energy of the plane landing will, as LFE, be sent directly to the sub, and the power -- or the lack of it -- from your AVR won't be a factor.
The 1513 doesn't have audyseey feature. It didn't come with the microphone
Could this be the issue?
AVR-1513 Power Output; Watts Per Channel 75 AVR-E300 Power Output 75 W (20 Hz - 20 kHz, 0.08% THD @ 8 ohms) per channel 120 W (1 kHz, 0.7% THD @ 6 ohms) per channel
175 W (max power output) per channel