I would smoke with the apple wood as well, it's a fam fav round here... Just don't add too many chips at once or they can catch fire... Apple is a light smoke & an 8# butt is a decent size hunk of meat. So you could pull it to finish in oven, but I'd just let it ride personally... But that's just my opinion, you do what you feel is best. With my MES, I have to pull the chip loader out 1/2 inch or so for good air flow but I use an AMNPS for smoke, something ya may wanna consider getting if ya get hooked on this addiction ! Open your vent at the top all the way, look for a thin bluish smoke.. That's the good smoke ! If ya see a white, heavier looking smoke you'll wanna adjust the chip loader for more airflow... The heavier white type of smoke can give your food a bitter, creosote type taste !
Good luck, post pics & let us know if ya need any help or have any more questions !