[pkopwqzsdcvbn]

A full all out projection will always feel more real the more of yourself you are projecting out of your body.

This reminds me of the ideas presented in the dream state programme to which I put up a brief summary at GOM.
Secrets of Sleep. Discovery Science
A look at research that suggests dreaming is an altered state of
consciousness in which future events can be predicted.

From the summary. 'During REM the old brain is active with the new/ higher brain being inactive. This was used to explain the lack of coherence in some dream recall.'
To your point a physical body factor re. the measure of coherence/ realism may be due to the degree that the higher brain has been able to remain in the loop and therefore to observe and be able to recollect the experience.
I also found of interest that the brainwaves in REM cannot be distinguished from awake brain waves.

http://gatesofmysticism.net/phpBB2/view ... t=rem#4388