TopendTorque - out of interest, the British military hasn't demonstrated vortex ring for very many years and doesn't even demo incipient VRS on any of it's many courses.
Why? Because, as Hihover says, if you teach your pilots how to avoid it then they won't put themselves in it.
I would suggest that military pilots operate in a far more demanding low-level environment than cattle musterers, especially with current ops in hot and high locations.
Yet we don't keep losing aircraft to VRS, how strange?
I have still to be convinced that you are actually demonstrating fully developed VRS in your aircraft - you imply you can enter and recover 3 times entering from 2000' and not going below 500'. That sounds like incipient VRS since fully developed VRS would give you several thousand feet per min RoD.
I know only 2 people who have encountered full blown VRS and they both took several thousand feet to recover from it.