Hi my friend @fxrob!
Here are the Hasegawa instructions on the Q-122...
...where they state that the plane was
IJN gray (Hasegawa states it as "Green (Mitsubishi)" at the instructions, but, trust me, it is IJN Gray 🙂 Hasegawa recommends Gunze H-61...
...or Mr Color 35...
which are "neutral", not too "greenish".
I have no experience on the three colors you have (AK and MIG), but I would choose the less greenish one, let's say, the one that comes closer to the above Gunze or Mr Color ones.
Looking forward to see your job!