The crusties are colostrum! I've heard not to mess with any crust/plugs because they're plugging your ducts for a reason.
My boobs haven't grown much, but they were huge to start with. 34F, now I'm a 34G, so really only one cupsize. I normally try to squeeze the girls into a 42D, and it works for the most part. Victoria's Secret tried putting me into a 38D and I laughed in their face and literally showed them what one looks like on me. I think that lady saw more rogue tit then than she has ever seen in her life!
I've been having braxton hicks for the past couple of weeks. They don't hurt me at all, but they definitely tell me to slow the heck down, as I only get them after bending/lifting or getting up too fast.