You want to just run the expandable tubing to the top of the cage, and angle it straight down onto/into the cage.
Having a plant/lots of foliage underneath it will maximize its effectiveness, as water will collect on the plant, and the plant/foliage will disperse it over a wider area.
Having close to the heat lamp, can heat the air/fog up enough, to have it hover, and create a cloud in the enclosure.