So guys, I want to say thank you. Not two months ago I sold a pair of Etys (package including the S adapter and a little adapter I didn't recognise but now do - the one that you use to plug in another cable). The reason, ironically, was that the stock cable was crackling and I was losing sound to the left monitor.
Little did I know and you've coached me through a special realisation - I've purchased an Estron cable second hand from here and a new adaptor (the S version because I like it better for electronica and hip hop), and they've both now arrived. The result is wonderful - a comfortable, microphonics free version of the ER4P. The red filters are ordered and on their way, but this is another moment when I've arrived at a solution that meets all my needs. I had the same experience with the ACS T1s, and I dare say had I realised this before I would never have pulled the trigger on those, or on customs full stop.
Comfort, freedom from microphonics, total unsurpassed isolation/attentuation, and sound that is close to my preference, hopefully very close with the red filters. And not only that, durable, with replaceable parts, and capable of use on long runs, at the office, wherever. Superb.