I don't exactly expect the same support of BIOS refinement from ECS that I do from some of the other larger brands, so even if there are BIOS problems, that's not that big of a deal. Does the board work at stock? Then its fine. OC is always YMMV. IF there are BIOS problems I notice, I report them.
For the Claymore, raised voltage per multiplier is how these CPUs are supposed to work. Perhaps overriding that didn't work perfectly. Meh. In my eyes, you don't buy ECS for OC anyway.
Really though, there are only so many people in the world that can tune BIOS "properly". This is not a skill that comes easily. Even if ECS wanted better, I do not believe there is anyone they could even hire that could make their BIOSes better. So I don't hold it against them.
If you can make a better BIOS for them, they'd probably hire you.