Ah, smoked chuck - the poor man’s brisket! You nailed it - it’s ok, but it’s not brisket.
Brisket is by far my favorite cook, but it requires a time commitment. As JoyfulNoise says, low and slow is the key, but I believe that a smoker is absolutely the best way to achieve the best results. Could be that primal instinct of fire and meat. I now have a kamado (thick ceramic), which helps provides a more humid/moist cooking environment, but one of my best briskets ever was done on a Weber Kettle with the Slow n Sear accessory, which uses a water chamber to add moisture. That tallow baste you mention will add flavor, but only to the surface, much like a sauce. The fat molecules are too large to penetrate the dense fibers of the meat, according to food scientists. If you use it, don’t overdo it, as you risk softening your bark, especially if adding it when wrapping.
If you’re interested in the science, check out Meathead’s amazingribs.com. It’s a great site that goes into great depth on smoking and grilling, and why certain techniques work and others don’t. It kind of reminds me of a pool site I know of…
Behold the best smoked brisket recipe ever! Texas style brisket is more than a recipe, it is a concept and a goal. It all begins by selecting the right meat, trimming it, seasoning it, smoking it, slicing it, and more. Follow this easy BBQ brisket guide for mouthwatering results!
amazingribs.com