The minimum rating you can get is 30%. I took mine all the way to SAFPC but I was fighting to stay. You could very well do the same thing and fight for a higher rating. In the end you know the min you can get is medical retirement. I WOULD DEFINITELY FIGHT FOR IT! Just know that it's going to be a long wait. I waited 10 months for my appeal to SAFPC to come back. Good news is it will give you that much more time to save money and prepare for retirement
Getting to stay really has a lot to do with what job you have. I was a 1A3 and the regulations would not have allowed me to continue flying. That coupled with CONUS only I think solidified the retirement option for USAF. Since I was trying to prove I was still operating as normal I wasn't expecting anything more than 30% If you fight for a better rating I think you could have a decent shot at getting it.