Guys... when are you going to figure out that you can ALL talk until you are blue in the face, and it won't matter.
Cohabbing doesn't necessarily cause her not to be responsive... it just causes a billion other problems. But, I digress.
Your female is not receptive; yet your male is in full breeding mode. This is common. Its not "dominance" related... its hormonally related. Some girls just don't hit the "mood" at the same time as the boys. Often, as soon as the weather even begins to warm, the boys are enamoured with anything that moves. She is not going to flag her tail until she is good and ready. TBH, alot of females won't get the chance to flag their tails. Holding still for a second is all the opportunity the male needs to lock on. The force and speed in which a male attempts to penetrate her is often all it takes to catch her off guard.
So until she is receptive, I would seperate her. Regardless of how you feel about your snakes stress level in the past, she is stressed now. Just because she hasn't layed off food yet doesn't mean that it isn't an possibility. A breeding female that refuses to eat is a baaaaaaaaad thing. If she means anything to you, I wouldn't play roulette.