That sounds kinda like you're talking about walking on different planes then, am I close, Zygo?
I guess i could say that I'm a little skeptic when it comes to etheric projection...I can see how one would do it if they had already been in that place before...but then it could be explained scientifically, hehe...As for astral projection on a different plane...I don't really know.
The only times that I have ever gone out of my way to find people that way, I was very careful not to try to "control" anything--at all--so that I could verify it's...uh..."truthiness" (hahaha)
I guess I lean on science in that way: I tend to use natural experimentation and try not to affect anything...which in the case of astral projection, is nearly impossible to prove anything. The mind is a more powerful thing than we are lead to believe, I suppose....