I took another look at the link. I didn't find the HD sets on the wire list, but I did see you can order "custom" wires.

As for double swedging: I've heard stories of single swedges allowing slipping (not breaking) of wires. That would be a quality issue of improper workmanship or materials. If you request a second swedge, its a safety factor and a statement that you don't trust the maker. But some folks do it for peace of mind.