Ok, here's the results of my experiment:
Before...
And after...
The trick is to completely cut through the track on each side between the track link joins as best explained in this diagram:
Note. Only cut as far as the purple lines in the diagram, about 1mm across the track from each side (but cutting completely through). Thats all you need.
I'll show you what it looks like fitted once I get around to it! Still not as good as the UM tracks, but better than the standard DS rubber look!
Jolyon
ps. Sorry about the grimy fingernails!