I can't take a Niki 1v1 in any plane, much less a 190a8. I've had some small success against them in GVs, since GVs hold up better than the 109 and 190. I think prolly without my GV kills I'm 4 and 60 or so vs them. Problem is I keep trying to fight them, knowing that it is stupid to engage one. I do it anyway. I bounce em, make 2 or 3 passes and then they finally get lucky and drag their nose around for a 30mph shot that hits me (yea, exageration, I know). They bounce me, I outta just bail out unless I'm in a G10 because they can climb and dive with every other german plane, and outrun the rest, but the D9.
I'd dearly love never to fight one ever again, except you can't swing a dead cat in a circle without hitting 300 or so of them.