OK, quick update here. Firstly I'm really impressed with these W30s. They are just what I wanted. Great levels of detail, good, even presentation, no lumps or bumps and although the high frequencies are all there, they never feel tiring.
I'm listening to tracks I didn't like before, just because it's more like listening to the musicians, than their product and when I get home in the evening from the tube journey, I don't want to take them off!
Over the ear, the cable microphonic are non-existent, which is a huge improvement over my Klipsch X11i.
So, I was struggling a bit with isolation, even when I did get a good seal with the Shure Olives, so I bought some Comply P-Series. Much better!. Now when I take them out, I can see about 7mm of compressed foam that was in my ear canal, rather than the 4mm or so with the Shure Olives.
Isolation is better, therefore bass is more abundant, but still good and solid with no lumps or bumps or booms.
However!...I still struggle to get a good seal every time so it got me to thinking about customs.
I contacted Snugsearphones and this morning, went to have my ears 3D Laser Scanned. A completely painless and comfortable process carried out in a local office, hired by Snugs. They will also visit you if they're in your area.
https://snugsearphones.co.uk/product/snugs-solo-full-shells-to-fit-your-own-earphones/
I watched as a 3D image of my ears was built up on screen and it took about 10min per ear.
I do need to clean my left ear slightly as he couldn't go quite as deep as he wanted to, but next week, after some ear drops and a quick re-scan, I should be fine.
At that point, the scan will be sent electronically to Snugs lab, I'll post them my W30s as they don't have a template yet and in theory, 4 days later I get custom full shell W30s back in the post. (They are detachable for cleaning)
I'll let you know how it goes and put some images on here, but in the meantime, here is someone else's review:
https://splurgebook.wordpress.com/2014/05/31/snugs-review-2/
and here is the 3D scan in action on YT:
https://www.youtube.com/watch?v=DDczkv1Jd-k