Contacting Potential PhD Supervisor: Including grades
I'm a little confused -- you're contacting faculty when you have not yet applied to or been accepted into the program?  What is your purpose in contacting them?  In my experience, at the very beginning stage before you apply, you might contact a faculty member to talk about their interests and what you'd like to work on, to see if you'd be a good fit, what the research possibilities might be, and so on.  Including all your background information at this point would be inappropriate, in my opinion.