Have you heard about the 5 day pouch test? Its help me and a bunch of my friends get over plateaus. My other suggestion would be to change up your work out. Try a new class or something, just to work some new muscles.
Here's the link to the 5 day pouch test. I hope it helps and congrats on your 80 lbs! That's amazing!:
http://www.5daypouchtest.com/plan/theplan.html