I am using a JR. XG11 but I imagine that it would be similar to your one. The first question you need to answer is how much power you want for any given throttle setting based on stick movement. For example I like a reSonably high level of throttle in the first half of the stick movement so I set the middle setting output at 70%. This means that when I move the throttle stick to half way I get 70% throttle at the speed controller. At quarter throttle it gives output of 42%. At three quarters throttle my output is at 87%. And so on.
This means I like to have a higher percentage of my throttle response at the lower half of my throttle range. I hardly ever go to full throttle.
The curve you set is to do with the power delivery system you have and personal preference for the range at which it should be applied.
You may decide to add in more points on the curve to fine tune the power response. You decide this mainly on trial and error from flying.
I have the zero set to zero with the trim back so when I trim up the throttle idle is at appro 3/4 %.
I hope this is helpful.