Start with stock and see what you think. Until,you have some “feel” for what’s happening you don’t have a baseline to learn from. My suggestion is go find two or three pork butts and do them one at a time so you can see how to finesse the vents a little and what methods work for YOU! What I do might not work for you. Keep in touch with the folks here and just go ahead and ask questions. Sometimes the person that has only been at it for a few weeks longer than you has just been through the same hurdle and it’s fresh in their mind.