That sounds good. I read somewhere (maybe on this forum) that apple wood softens the effect of the hickory. I always hit my smoked meats hard with hickory smoke, and some might think it is overwhelming, so I used the apple for that reason. The chopped/sliced/pulled brisket is in the fridge today and at least some of it will be on the dinner table tonight. Can't wait.
If your temp gets up too high, you'll have some burning. And if your humidity gets low, it might dry out.
One other tip: Trim the hardened fat down to 1/4 inch at most. Mine had some heavy chunks of hardened fat, so it required some trimming. I still ended up with some portions that were mostly fat, which I discarded when chopping/slicing/pulling.
Happy smoking!