I have a Champion 6-lever Miller padlock like the one in your book (pg. 380 on the Google Books preview), and I'm wondering if you have any insight as to how it can be picked. You gave it a 3-4 (out of 5) pick resistance rating, so there must be some way. :P
With the one I have, the top lever in the pack had rusted badly enough to break the spring, which means I might be able to get a very thin pick over the top of the pack and push directly against the locking mechanism, but I don't see any obvious way to pick this lock if it were in prime condition. The only thing I could see working is some type of impressioning, but the specifics elude me at the moment.
-steve