OK, Murray, here is what I see. First, the frequency response (Blue=before Audyssey, Red=with Audyssey):
Mid row looks the best, then back row, and finally, the front row. All three show significant adjustment in the high end. There continues to be some lumpiness below 100Hz, especially on the front row, but likely the best you can achieve, given the complexities of a 3-tier theater. I don't see any reason for concern.
Bass decay (waterfalls), Audyssey on:
Mid row looks great, front and back rows look very good. Considering that your objective was to improve the bass response, I would say you have accomplished the objective. Good job!
And the reflections (ETC) before and after the towel (green is with the towel, both are with Audyssey on). BTW, in the future, when analyzing reflections, it doesn't make a lot of difference if Audyssey is off or on. Save yourself an extra set of measurements. And all of the ETC graphs are suspect, because we cautioned you to measure only one speaker at a time, and it looks like you measured left+right.
The front row shows a big improvement (-10dB) at 5ms. A bad reflection persists at 3ms, and a not-so-bad one at 8ms.
The mid row shows a slight improvement at 4-5ms, but nothing else.
The back row shows the best improvement, -9dB at 1.5ms, -10dB at 3ms, -10dB at 5ms, and -10dB at 8ms.
I wouldn't conclude too much from the ETC analysis, other than there is improvement to be had, if you want to work on it.
So, time to take a break, Murray. I bet you are pleased with the progress!