This may be a no brainer, but lets say an agent asked you for a partial submission. Time passes, maybe a few weeks, and you've heard nothing back. In that time, you have made changes to the ms, including the sample chapters that you sent this agent. Would it be wise to contact that agent and tell them that you have made some changes to the chapters he has and that you'd like to send them the new, revised chapters, or do you let sleeping dogs lie and hope what you've given them will be enough to pique their interest into requesting a full submission? I'm thinking the later, but it bothers me that the agent doesn't have my latest stuff to judge me with now. Any thoughts?