Brad-
can't wait to try it. So I'm curious as I don't believe you have installed 3 bolt anchors on your other lines. Any particular reason, rock quality, etc?
Two reasons for two different three-bolt anchors:
At the top of the first pitch I put in an absolutely bomber (nearly granite hard rock), perfectly equalized two-bolt anchor. But, knowing that we'd have up to four people up there at once, and seeing that there was a lot of room there to stand on big lodestones, I put in a third bolt 30 inches to the left to accommodate multiple people (yes, a convenience bolt).
Yesterday, at the top of the second pitch I started a first bolt from a stance in what I thought was OK to good rock. The hole then went to hell, and while I was able to place a long, stainless Rawl-type bolt that tightened up nicely, it's not a great bolt. So I used that first bolt to hold me while I placed two more bolts (one good and one great) a little higher. These two upper bolts have the rappel chains; we didn't even bother putting chain on the not as good bolt.
Whatever happens, the belay bolts have got to be good. I think I had four failed holes after the first, not so good bolt at the top (maybe five extra inches of drilling for failed holes - I was pretty damn spent by the time that anchor was done). As indicated above though, I did eventually get in two belay quality bolts.