Well, all's well that ends well... albeit expensively well.
I've not had a set of custom moulds made for the X10s from here: http://www.audiorelief.co.uk/shop/product_info.php?cPath=27&products_id=39
It kind of defeats one of the main purposes of the Images, namely how magnificent the isolation/attenuation is with the sleeves that come with them, and the fact they get inserted so deeply and comfortably in your ear canal... but I'm now on my 3rd set having returned two with cable issues, and with each of the first two sets the strain relief on the buds was in the process of disintegrating because they were being bent back 'against the grain' cos of the shape of my ear.
So it was expensive - another £90 on top of it... and I have to up the volume a notch to get the same effect... but I get complete isolation and the wonderful sound of the X10s now, and if I ever need to get another pair I'll just slot them into the customs and they'll last longer.
I'm hoping this will extend the life span of the earphones because honestly I'm 100% in love with the sound.

