These might not directly address your 12 to an inch quest, but here are some other interesting "experts" chiming in on hand quilting:
I don't know if you have to be a paid member or just a basic (free) member to view these, but Alex Anderson has a series of lessons (over 15 so far) on the abc's of hand quilting in the classroom over at The Quilt Show site.
http://www.thequiltshow.com/os/lesso...r/alexanderson
I haven't had the time yet to watch them all.
And as I'm a loyal follower, I always ask WWSD (what would Sharon do)? Here's Sharon Shambers video on hoopless hand quilting.
http://www.youtube.com/watch?v=bDcLMiR2SAo