I have added a link to the page in my book showing the Spring Spiral pattern, normally found at a potential spring site. It is at http://www.geopathfinder.com/SpringSpiral.pdf
. It's certainly interesting that the cloudbuster generates this water-energy-related pattern. The higher energy in the center and lower at the edges matches parfectly.
No, I don't think you could overdose on this energy, if it is the same as found in the Spring Spiral, since it affects only the outermost energy layers of a human.
I don't know why it's less within the building. What is the construction like? What kind of floor, any metals in it, what kind of walls, metals there, etc.?
I'm not familiar with the cloudbuster's exact pattern, or with what Grahame found above one, but the Spring Spiral definitely isn't a vortex, just a set of parallel, equidistant, vertical planes.
The Spring Spiral straight portion continues outward, but with reducing energy, reaching zero at a bit over 500 feet from the center, at least with the one in my back yard.
Great job dowsing this with a pendulum! I would never have the patience for that. The ending point in your neighbor's yard appears (when dowsed from here) to be a small Cavity Vortex that has not yet formed a sinkhole.
"Develop an infallible technique, then place yourself at the mercy of inspiration." (from a craftsman, but it applies widely)