Thanks for the comments rollo, I'm happy the DD is working out for you

Just to reiterate though... I don't expect the DD to work for everyone and the D2 is well worth trying too. Systems and personal preferences are too different to have one cable that everyone will like.
As for an all silver IC, the ground wires don't make as much of a difference as the signal but it does have an effect (as does pretty much everything) which is why I use UPOCC copper instead of much more expensive silver for the grounds. I do have an upgrade to UPOCC silver grounds and I can also make all-Duelund silver cable, either side-by-side which is what Duelund does for their own cable, or a 3 wire braid. It'll cost a lot more money though. For RCA plugs the only all silver plug I'd consider is the WBT at $408 for a set of 4.
So an all silver IC using a Duelund 3 strand braid and WBT silver RCAs would have to go for about $1k, that's getting up there and I'm not sure it would actually be a better cable than the current DD you have.