I would think that should happen. But it doesn't always work that way. Sometimes there is very little change showing after resetting it.
The drum dial shows how much tension is on the head at any given point. If you loosen only one rod while all the others are still under tension, the single loose rod will read higher than if all the rods were equally loose. Hope that makes sense...
Tunebot measures pitch, not tension so it's kind of a an apples/oranges comparison.
John