After days and days working on this problem I've managed to get a Genesis 8 character into iClone via 3dxchange 7 YAY !!! I haven't tried Gen 3 yet. 
The jaw and eye bones are still not being mapped but that is a known issue and an easy fix. The big problem was getting the visemes and muscles mapped properly.
After reading all the posts concerning the genesis imports I started thinking there's a system fault causing a problem that 3dxchange can't work around. After a week of scanning and fixes and scanning and more fixes I used tweaking.com free, which goes through windows like a dose of salts and takes hours. There was a scary moment when after the 1st reboot a checkdisk scan died which lead to my documents folder being rendered unaccessible  DOH !! That would have been over 900 GB  of data and assets that would have needed reinstalling. A reboot and another checkdisk scan repaired the issue.
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Hope this helps.
p.s.  Apparently theres an update for 3dxchange 7 out soon.










Homebuilt computer - Windoze 10, INTEL i9 9900 k @ 5.1 GHz, EVGA RTX 2080 TI XC ULTRA, 16GB 3100 MHz RAM, Asus  Maximus Hero XI motherboard, Sound blaster Z series. iClone6 & 7 Pipeline, Crazytalk 8, Crazytalk Animator 2, Facefilter, Pop video 3, Hitfilm 4Pro, Cubase 8.5 Pro,

OLLIE!
Oh man...that looks awesome, OB!