Didnt see the most common low-E situation mentioned in detail so...
Often the MA is so busy, it is wise to just get out of the way of the closest threat, rather than getting tied up trying to fight the closest threat.
If someone is diving on your 6 and they are clearly way faster than you, wait until just before they are in gun range, and reverse under within 45 degrees of vertical.
Watch their reaction while you're doing this. If they try to follow your turn, they will only turn a big arc around you and overshoot, or compress and end up much lower. If they start to follow for a shot then brake, you are at least faster than when you started, and going opposite directions. If they pull up, then you dont even have to complete your reversal, and can start planning the next step to surviving.
One key point to remember about a bogie on your 6 is that unequal E states=managable, equal E states=very bad. In this situation if they are much faster there is only a brief window for a shot at you.
Where Wildthing is describing a series of flat turns, he is not only evading, but he is also keeping speeds unequal, closing the window, and positioning to have a shot on them as they blow by. Very efficent.
Where in some situations I suggest allowing them to dive, and just keep flying along till the last second, you would be unequalizing speeds as long as possible, then pulling a speed gaining manover at the last second. Also very efficent.
The strategy in defending in a situation like this is to farm out the E difference to your advantage, either by seeking an overshoot, or evading enough times that the E difference becomes small enough for you to go on the offensive.