Congratulations on a well made sail, Jami! Looking very good. I'm just wondering why the telltale on the lowest panel isn't stable, but turns through a circle - is the bottom of the sail over-sheeted a bit, in relation to the rest of the sail? I suspect that this is the case, if reefed, and is why I go for upper and lower sheets to get better control of twist.
And hey, that windvane looks just like mine! Actually, I'm thinking of trimming a little off the height and/or width, as it seems to be a bit more powerful than necessary and fouls my outboard motor occasionally, when that is raised out of the water.
Also, the vane is leaning in the direction that implies that you have some lee helm.