You asked, "The PRP has given me great pain relief, but is it going to heal anything?" The answer is "probably." PRP is becoming a not-so-secret weapon in the realm of treatment for damage muscles. Right now, I am nor sure how much data there is on the gluteus, but more data is being gathered every day. Be sure to let your treating doc know right away when/if the pain begins again. The process can be repeated while we wait for other, more permanent therapies like stem cells to be perfected.
Let us know how you are doing after a while.