I've been using the Big Chief for the past 25 years or more (the same unit - bullet proof and lasts a lifetime) - thought I would give it away after I purchased the Bradley, but am glad that I have not.
I've several other cooking units, but I like the simplicity of the Big Chief, and still use it for dinner salmon and beef jerky.
My method is very simple although it goes against all the advice I have been given about cooking salmon. All I do is take the fish out of the package and smell it - if any "fishy" odor, then I rinse it and pat dry with paper towels. If it smells fresh, then onto the middle racks it goes into the Big Chief with a pan of alder. Once the smoke stops coming out of the unit, I check it for the presence of what most people call "salmon buggers" which are lines of salmon fat that has risen to the surface - if the fish flakes then it is done. Caution however, I like my salmon on the rare side, silky smooth, tender, moist, yet still flakes easily. If it is not done, then another pan of alder until it is - the smoker is at the mercy of the ambient temperature.
I've also done the same on a Traeger, which is almost as simple - smoke until I see the fat rising to the surface and then test for done-ness.
The salmon candy is another story altogether - because the fish ends up much firmer, I do not want to lose any of the fat so the temperature is taken up in stages so the rapid rise does not result in surface fat - not my method - designed by a chap on another forum - Kummok
Best of luck on your salmon - it is difficult to ruin salmon unless you overcook it!