Ginge, there was a time when aircrew were subjected to "Practice Ejections" on a rig that could be moved around different RAF (and maybe FAA) Stations. So the community from which you could get data may be much larger than you think.
However, I feel that, when you search the literature, you will find that there has been a lot written already.
By the way, are you interested in changes during ejection or as a result of ejection? If its during, you don't get very long to make notes...
