Couldn't these "communications" just be in your heads?
The late Carl Sagan, atheist, admitted that he missed his dead parents and sometimes even was stimulated such that it sounded like his parents spoke to him. He didn't think dead people were really talking to him, why do you?
There have been times when I thought someone called my name, but when I looked around there wasn't anyone. I don't know the reason the brain (or auditory nerve) sends these false signals, but I don't assume that dead people are trying to direct my life. Why do you?
There were a few times in my life when I was halfway asleep and imagined someone was above me. I could even begin to picture them. When my rational mind kicked in and suggested I was hallucinating, the hallucination disappeared. I can see how ancient and modern people imagined that demons or aliens visited them.
If you want to and encourage your mind to fantasize, I think it can.
Have you tried putting a microphone to hear the words of these deceased persons? I think you'll find that no sound is being produced. That's one reason the die-hard supernaturalists suggest alternatives like telepathy that bypass scientific detection.
Rather than trying to preserve the sinking ship of supernaturalism among the rising waters of science, by suggesting ways in which it COULD be true, why don't you just let the outdated ship sink? Use Occam's razor.
It seems to me that supernaturalists don't believe in this stuff BECAUSE of the evidence, but they look for supporting evidence or at least the lack of absolute refutation for what they already irrationally believe. If they can't find adequate evidence for their religious belief, they at least try to argue that science can't prove it couldn't be true.
If flaws in science can be found, this builds their confidence that maybe their religious belief could be true.
Is this what you're doing?