Over-tightening a BB
I don't think anyone uses a torque wrench for installing the cups. If you did any damage, it would be to the threads of the BB or to the threads on the frame. However, unless you were an ogre when you tightened it down or you cross-threaded it, I doubt you did any damage. I do hope you used grease/anti-seize though, since you may ruin the threads if you didn't. You could also have damaged the spacers for the BB, I suppose, but it'd have to be pretty mangled if it affected the chainline and Q-factor significantly. So, if its this which you're worried about, I'd just leave it. Given that you have a Sugino crank, I'm assuming you probably don't have spacers. 

When you're installing the crank, theres a cap you have to put on -- this only requires something like 0.5 Nm. If you overdo this, you'll load the bearings such that they wear down faster. If you've overtightened this, you need to undo it. Same with putting the non-drive side crank arm (which is something like 15 Nm normally).