Well, to be fair I know the relays aren't the top of the line but they have very solid reviews (
on amazon ) and once established I can easily swap in some nicer units as they are standard 87 type. Biggest gripe is the smallish gauge pigtails but that can be mitigated by trimming them very short. Plus I finally found some 12awg terminals which should fit in there to replace the B+ and positive leads with. I'm not sure I understand your comment about the candlepower store sockets. They are DIY assembly with 12awg terminals, as long as the assembler does a good job they should be fine.
As for the independent vs common, I simply meant that I ran a separate relay for each side with a control circuit for each side from the factory plugs. The highbeams WERE designed to share a single relay and a single control circuit fed by the passenger side plug. Still pretty frustrated by this as I have found MULTIPLE sources showing the H13 is wired as I built these... but the factory wiring diagrams disagree and I should have double checked that first
In any case, they seem to be working well at the moment and I have time to tweak it as needed.