What are the principles of air combat? They aren't necessarily simply the Dicta Boelke, those are simply important rules of thumb, not a straightjacket.
For example, Richard Bong, the top-scoring US ace of WW2 in the Pacific, often remarked that he was the worst shot in the Army Air Corps. His solution to the problem of how to make kills?
It was to get on his opponent's six so tightly that he could not fail to miss because he would then be left with a point-blank straight ahead shot. No deflection shooting whatsoever. Why bother? For him it would only have been wasting ammunition.
But how did he get there? How might he have achieved on-six and close-in so often?