This year's end of season display pilots' seminar had a very interesting presentation about this entire subject.
In short, I'll tell you what my chum and I were so amazed by that we even talked about it on the way home....
Statistically, by a huge factor, most air to airs happen in the circuit. Of those 60% are run down from behind - Mrs Breakneck you may have a point, so I suggest that you acquire a faster aeroplane!
Stik