Beechy, I too would love to see a pic or few of that jig. This is a common problem I run into. I notice it first when I've taped a spine and I see one part of the tape wearing off first. That tells me I need to hone naked for a while until the spine is straight, then re-apply tape.

I ALWAYS tape the spines. No sense putting more wear on any part of the blade that doesn't need it.