I just purchased a used ECB on craigslist. I am using my good friends Jim and Debbie as guinea pigs fom my first rack of baby back ribs. I am planning on using the 2-2-1 method (actually gonna try 3-1-1) My question is this. How many chunks of hickory/mesquite do I use? do I need to add additional chunks for a 3 hour tour? Lastly, I am gonna smoke a pork shoulder on Sunday, How many chunks of hickory? How often should I expec to add wood? Thanks for your responses.