A second good way to reduce stress is physical exercise. They rarely hurt even when greatly annoyed and seriously thrashing the mitt. I sometimes add little jingle bells, and one mitt has a squeaker in the thumb. The mitts are their favorite toys, and the physical stimulation is a fantastic stress reliever. A third stress reliever is to minimize cage time.
Cages are a great source of stress to an animal that is inherently curious and active.
I know, I know, you can't leave them out all the time, etc. Sure, I understand. But maximize the outside time as much as possible. Fourth, reduce distractions. If you leave your cage in an area frequented by people, cover the front with a blanket, or turn the cage so outside activities are not so distracting.