this has been asked and discussed many times on this forum. use the search function and that will be helpful. in short, you will find those that feel taking usmle is helpful and those who dont. It snds like you have decent comlex. IMHO why take the usmle now and tank it and then where are you?
Also, a program that insists on usmle is prob not too DO friendly, though that would be rare in the PMR world.
good luck