If your boobs're getting in the way of your guard, you could try taking lower stance kind of like Joe Frazier and put your hands out in front of you to maintain a tight guard. I'm a C cup booby person and to be honest, I haven't had any problem with them getting in the way of my guard so maybe you just need to adjust your stance a bit.

In regards to pacing yourself off of what your opponent is doing...don't do that. Have an attitude of "What the hell are you doing in my G**Damn ring, you piece of s***?" Demand that you set the pace and move that b**** around your ring so you can set up your shots.