This is a good video don't think it answers your specific question.
https://www.youtube.com/watch?v=LthFu6fxjeM
I think the question you are asking is not going to get you a better answer than just doing the experiment yourself. I have shot the FC (fixed crawl)on different bows that I have and the effect varies depending on the bow. So I couldn't even answer the question for my own bows without running the test.
Several issues.
- An elevated rest by itself can allow you to shoot with less issues over clean arrow flight. It can make it easier to shoot vanes. For hunting I prefer shooting off the shelf because I feel that I have better control over the arrow. All this has nothing to do with FC but it could make your setup better just because it is a stick on rest, or whatever.
- It is hard to believe at this point, but the idea of shooting off the shelf with recurves had so fallen off that when I got into archery, people like Asbel, and publications like Bowhunter, actually wrote and published articles on how to do it. The recurves I first picked up did not have a shelf, there was a sloping radius where the shelf would be. You had to get a rasp and go at it. So all these bows were tillered with it in mind that you would shoot off an elevated rest, therefore the baseline position for split finger, and appropriate tiller and probably sight use, all revolved around an elevated rest.
- If on the other hand you have one of the many bows made since the 80s with a shelf for the arrow, then to go elevated on a bow that was setup with positive tiller will slightly reduce that bias, and tend to push the tiller to the even situation, which oddly to me, is not what string walking prefers. If it was level tiller you are going to have a negative tiller when you are done.
You can sorta deal with these situations by moving the nock point. Or if the bow has adjustable tiller. On the other hand I have a long draw, the limbs are normally tapped out at full draw, and I don't get away with much messing around with the nock point.
My Expensive Black Widow bow has 3/4" positive tiller which is crazy. Stuff like that will take over from any advice you get, you need to look at the reality of your situation. Though one can overdo all the fiddling, I normally set my nock high, and just start shooting, and let feel take over. Be in touch with how it feels. Does the bow cooperative and is steady at full draw, or is it all messed up and fighting you. Trust yourself to get your best tune.