There is no such plane, or any plane is such a plane.
The problem is that you need to define "do really good in MA" better, because first off there are late, early, mid war arena. And "doing really good" can mean bring you home in any case, win most 1v1s, get high k/d rate, get high score, be able to jabo, escort, defend and precision strike etc.
The problem is that with trying out you dont know, because what you dont know what the plane could give you.
Definetly spit 8, ki 84, p38, p47, typhoon, tempest, N1k, p51b, LA7, 109G2, F4U-1D, 190A5, F6F, Yak-9 all fit the list so far.
I would try P51B,Yak-9u,Ki-84,P-47D11,Spit 8.
And i think ALL planes are verry hard to master.
While the Spitfire is good in turnfights, its still hard to get home since the lower top speed gives others the chance to escape and come back. As well as it has some fragile points, which i dont want to mention since i fly one from time to time.
EDIT: You want a plane that is hard to master but complain that you have a hard time in 109s? Definetly in my opinion 109K4 would be the plane you look for....but its really hard to fly in turnfights.