WTB people running around under hitcap testing for me, will pay in cookies!
Also Nixx posted here saying why he thinks mastery might behave this way: viewtopic.php?p=22856#p22856
I think he is basically saying that a mastery proc isn't treated exactly like a tick from an already cast dot, it's treated as if it's own little one tick dot (I know the idea of a one tick dot is a bit absurd) where when it happens the chance for it to hit/miss and crit/or not are figured out for it.
So basically the process is does a proc happen, does it hit, does it crit. I could see this fitting in with what GC said awhile ago though what he said could definitely be seen to confirm the way myself and Twin interpreted it (basically that a mastery proc shouldn't have the chance to miss).
@Acia - the reason for confusion on it is at some point GC said mastery procs behave exactly like regular ticks (can't remember exact wording but it was pretty much that). If they behave exactly like ticks, then one would think they shouldn't have a chance to miss.