Is there a specific reason why you don't use the M200 instead?
Also, how's the driver flex for you? I'm about to send mine off back to KEF because the left channel's low frequency driver broke on me. I'm not sure if the driver flex had any part in its demise but I'm suspicious it might have something to do with it.
I was getting driver pop as well when I was trying to get them to fit correct. One has to wonder if this will be a problem for the KEF earphones. It is too bad too as they sounded awesome to me but you can have the best sounding set of earphones in the world and that sound won't matter much if you end up fidgeting with the phones 90% of the time.
I look forward to whatever those guys do for their next round. I hope they learn from the design flaws of the M200.