That's a sweet piece of steel!
I voted 300 fps, and here's why. It's got a short barrel, which is more conducive to indoor fights. Anything beyond 300 fps for indoor games in superfluous in my opinion (actually anything beyond 250, but that beside the point).
Since this is not your only AK, and I assume the other one is upgraded, it would be a wise choice to keep this one tricked, but with a low fps.
Not to mention the fact that a HS motor will not do well with any spring/gear ratio that would allow 365 fps.
But that's just my opinion-which is what you asked for!