you don't need to maneuver for separation at all, unless a rolling and flaring is considered maneuvering now.
IR missiles are so stupidly evaded currently, and i highly doubt a real world tactic for evading IR missiles is to point your nose toward it, roll and pop flares.
And inside 8nm the aim-120 will hit your plane 100% unless you turn away from it or you are really slow and notch it, at which point you'll still die because he'll be on top of you, while all the eagle needs to do to evade an et is again idle, roll, flare, he doesn't need to turn away from his target at all (that goes for any plane fighting IR missiles).