Status update.
I think i starting to get it finally.
First thing i realized is that you don't have to control your stick all the time, a few nudges from time to time work fine.
Second one is that vertical aiming is problematic for me since i instinctively want to compensate which leads to me pushing it too far up or down and then i overcompensate for that a d so on So i started avoiding raising or lowering my right stick and it finally started to make sense.
I've played Half Life 2:Black Mesa and Portal 2 (pc split-screen co-op, hell yeah) both of games aren't really big on aiming.