It's been quite a while, and it's hard to tell exactly what rib that is, but I shot (off set) or squeezed every one of those - how else, right?

. I used this yolk:
http://www.cleavelandtool.com/25-Fla.../#.WCjrGLQ8KhA
I just went out and looked at all my rivets in similar locations and the all look really nice, so I obviously didn't have any extreme angles. There are times it seems that the squeezer won't work, when it actually will; I'm just not seeing the proper angle to make it work.