DMac,
I smoke mine at 230 deg. I have a bullet type water smoker, and only have two racks, so one on top and bottom.
I don't have a Cookshack (yet
) so I'm not sure if it will be much different. I have done alot of shoulders (butts) all in the 7-8lb. range and have never had them come out any less than 2hr/lb. I'd give yourself that much time anyway, because you can always hold it in a cooler. (one of the greatest tips I've gotten on this forum) When I first smoked a shoulder I had people waiting to eat because I was also planning on 1 1/4 hrs per lb. It's never happened yet.
As far as rub...I'm pretty partial to the rub I've been using, called Southern Succor Rub. I've always gotten a really nice "bark" (the secret is the Turbinado sugar) with this so I've stuck with it. Matter of fact, I'm about to make another batch today. Here's the recipe in case ya wanna try it:
Southern Succor Rub
(Used for many cuts of pork, including shoulder)
� cup ground pepper
� cup paprika
� cup turbinado sugar
� cup salt
4 tsp. dry mustard tsp. cayenne pepper
Makes about 2 cups
Mix spices thoroughly in a bowl. Store covered in a cool, dark pantry.
I'll be on and off here all day today in case you have anything else I can help ya with.
Have fun...
SmoKen