I wonder about using small repetitive stretches (not intended to increase range) going into and out of the comfortable maximum position, to develop the awareness of what a stretch feels like. (I also strongly agree with Nathan's comments; particularly sensations from areas like the wrists - and I would include ankles and fingers, but not use the neck)*. As pointed out, I also guess that one problem with having a tight insensitive body, is that it is so easy to go to the final position that everything locks up immediately, and this becomes the normal sensation, so is not experienced.
In my (