I love those nights, and same as you, they happen to me every couple years or so.
The K/D is great when it's high, but the ones that make me the happiest regardless of whether I win or lose are the nights where it feels like I can hit what I'm aiming at no matter what the angle is, and am putting the plane where I want it.
I know my moment of joy last night in my K4 came as I followed a P38 up that had misjudged my E badly and put 2 taters into the cockpit as he was in perfect planform coming over the top. The plane literally filled the windscreen when I pulled the trigger. Nothing spectacular about it, but it was one of those moments when everything leading up to it just went right.
Wiley.