Also, my only concern with clipping my mics on my shirt collar is that it might pick up some breathing and throat clearing noises from me.
well, the BB is not going to affect clipping either way(unless you get one with a bass roll off,and thats not a gurantee) just make sure that your levels are set just right,not too high,thats where your clipping comes in.
i run hi-mds so i am not familiar with the operation of an MT.
the mics..yeah, you could get some unwanted noise,but if you keep it cool,you may get a better result with your mics up higher verses down on your shirt.i always go with the collar.wait until between songs to do any moving,drinking(speaking of that use the restroom prior to showtime,you dont want to have to go mid-show and lose music) it is difficult but rewarding if you can do it.
good luck to you