I am going to be smoking 4 - 7 lb Butts tonight on my Large BGE. I have never smoked more than 2 at a time. This time I am using a multi level grate - 2 on top 2 on bottom. Should I rotate half way through the smoke or leave them alone. Drippings - is it okay for the upper butts to drip on the lower butts? I assume it is - just checking. Also, should I expect the time to increase with more protein on the smoke? Thanks.