ORIGINAL: Greg / MO
Yep, Kodiak gave some good advice. With my fallaways I'm using nowadays, I offset as hard as I can and still maintain fletch contact with the shaft. (Actually, I'm using helical these days ... but the point is the same.)
The same minus the helical. I'd helical with 3" or 4" veins or feathers but with Blazers I offset as hard as I can and still make arrow/vein contact as Greg stated.