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@bmxconan
I'll add my 2 cents - I think there is a right and a wrong way of doing things, but in most cases they both still work. My sugino messangers came with a shit RPM BB. 500 miles later and it's f***ked, cue un54 BB thats 7mm longer (bought out of necessity). 1000 miles later and no problems - solid as a rock in fact, no more chain wear or other discernable disadvantages. I would choose a un54 over a miche BB every time (there's a lot of threads on here that testify to that). Do I care that my messangers may be wearing funny -no. I've seen a lot of horrific bodges as far as BB's go and as many examples of compatible cranks/bb's failing. This doesn't really help you - I just think some people go to extrodinary lengths (expense) to get their chainline perfect, when a mm or even 5 is still workable, it just means your drive train is slighty less efficient. Don't get me wrong - if I'm running a set of DA 7600's, I would want to run a hatta/sugino BB and I'd be a lot pickier about my chainline if I was running a dolla regina chain an 75 chainring / DA sprocket combo. A lot of situations just don't call for the same attention to detail. The other plus with shimano BB's is any bike shop has the tools to remove them and will more than likely have a spare. The same cannot be said for campag or other iso BB's
You've got a shimano tool, a un54 is £15, you don't have any guess work as your cranks are already running on an jis bb. I would just stick another shimano bb in.