Sorry, up late! Your question deserved some listening. I have taken the RS1is down from the bedroom where they go straight into a Chromebook Pixel or the Audiolab M-DAC (and then to a desktop) and brought them downstairs and plugged them into the Lehmann Linear SE (fed by Schiit Gungnir and an Oppo 103 or a laptop) and have tried them with L and G cushions with Tom Waits 'Foreign Affairs', Paul Simon 'Graceland' and the Szell EMI recording of Mahler's 'Des Knaben Wunderhorn'.
O.K. You need to turn the volume up, but there is no loss of midrange between the L cushions and the G cushions IMO. Perhaps there is a loss in 'in yer face' quality, but timbre and definition are enhanced. There is a huge improvement in soundstage and in the treatment of backing instruments, acoustic environment etc. Percussion and plucked instruments can sound brittle and compressed the the L cushions, but become more natural with the G cushions. For the music that I listen to, there is no contest. The midrange with the G cushions somewhat overshadows my HD800s in voices (I am talking so much heresy in this post - i should have done it under another name). YMMV. I'm happy that I bought them.
O.K? Now where do I go to be burned at the stake?