My 2 cents re: bass quantity / impact. I've had the Ether C's for a few months now and put ~200hrs into it. My initial impressions were also that they felt "light" in terms of quantity.
I have noticed a marked change in quantity (probably somewhere around 150hr mark) - I didn't really keep track on how long I was listening for, but that seems about right. I have the 1.1 foam in there as well now. The extent of the increase might include some expectation bias, but no question there was a change.
I recently listened to a well-broken in set of LCD-XCs and did a direct comparison to my Ether C's on my equipment (Centrance HiFi-M8, my source music). No doubt, the XC's have a fuller, thicker bass (Audeze house sound). Even with breaking in, I don't think the Ether C's will ever get to the same level. The question is, if that amount of impact is "good" / preferred, and whether the Ether C's bass is enough for your preferences.
For me, I'm very pleased with the bass (quality and quantity) of my Ether C's now - post break-in / 1.1 upgrade (no additional tuning pads). It's clean, tight, crisp, and detailed, and the "slam" is enough for me.
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