I have the same lock setup as you except I got the standard new york lock so I could lock the frame AND front wheel to the bike rack. Then I use the second U lock to attach rear wheel and frame together and the cable for the seatpost/seat. This way seems easiest and most effective for my campus. If I could lock both U locks to something that'd be best, but still someone would have to either saw through the new york lock or bike rack, and then open the bulldog mini lock on the rear in order to ride off. If it's possible I'd return the mini for the standard NY lock - it's pretty similar in strength and makes locking up in places easier especially if you mainly have bike racks at a college campus.