Hi,
Probably best to start with the basics…
Do you have previous experience of flying helicopters in flight sims?
If you are totally new to them they can be extremely difficult to fly to start with. If this is the case you are very unlikely to find a solution with joystick settings.
I would actually go back to no curves and with sensitivity set to 0% on all axis for helicopter flight controls.
Set the cyclic axis to the stick of course. Use your hardware throttle for the collective axis. You can actually get away with not assigning the throttle, most helicopters have a governor so there is not real need to adjust the throttle as such.
For anti torque pedals use rudder pedals if you have them. If not use the sticks twist action (if t has one) or maybe a analogue rocker on the back of the throttle. Sorry I am not familiar with the X52!
On a similar note I would also actually turn assists off.
If you can remove the centring spring on your stick or use cable ties to compress the spring this would also help. Constantly pushing against the spring whilst flying a helicopter make them both harder to control and can become tiring on your hand/wrist very quickly.
As hard as it may seem, try to relax and do not beat yourself up for feeling like you have no controls. I repeat it is hard when you start out.
It is quite a slow process to progress at first and that progress only comes with perseverance and practise.
When you start out just try and keep your movements quite small. It is common and almost natural to over control the helicopter… do this and you will end up out of control pretty quickly.
When you raise the collective do it very slowly and as soon as the helicopter starts to move stop raising the collective. Use the pedals, and cyclic to counteract any movements. once you have done so continue to slowly raise the collective and again counteract any movements. If you do this right you should gradually pick up off the ground into a reasonably controlled hover. Thereafter it is really a case of continuing to make those tiny movements to remain in control.
At first I would actually just concentrate on picking up off the ground as above. Once that starts to seem somewhat natural then just try edging the nose down a touch to move forwards. The do the opposite to slow down and try and return to a hover.
That’ll do for now… plenty to try out for now! 
Stick with it. Keep practising - good luck!