If you set up your linkage so that the servo travel is matched top and bottom. My Travel adjust is 115% HI and 118% Low. I'm using the outside hole on the YS throttle arm. And I'm using a small servo wheel that gives full travel at the basic 115% ATV each side. I set my Idle trim since the JR has a mechanical trim on throttle to the mid notched position, and then I adjust the ATV up or down to the idle to the desired rpm for flying.

If the idle adjustment is off more than about 5-10% from the Hi throttle stick ATV I adjust the linkage to get symmetry there.

Now for the big secret of my throttle curve. Its a super secret and you can't tell anybody. But I just shot a photo of it.

It is attached below. I really don't think it was the magical inspiration you were looking for.

It comes up a few extra percent above idle to help with stall turns and small throttle corrections at idle. Say a 45 degree line into the wind is a little slow and loosing its angle a couple clicks of throttle stick helps maintain the line.

Then the line goes pretty much linear form there.

Each engine will be a little different. This is the curve on my 170DZ in the Astral XXc. Prop is a highly modified 18.1-10W that has been pitched, clipped and re-shaped. Basically the prop started as a 18.1-10W and now it is a own design using he 18.1-10W as a blank.

Velocity stack installed. WOT on CP 30% Heli is 8200-8300rpm.
Once I get the engine running properly and the ATV adjusted to give me WOT throttle and idle with nearly equal ATV % values...

I then dial the ATV back at Hi stick to get rpm of 7900rpm. Which is 90% on the High throttle side for this engine on this model.

The Engine now makes great HP and also passes F3A sound test with the prop I'm using. The full wide open system is 95-96db(A) so it will make sound on the AMA classes without any reduction in the RPM. But F3A rules of 94db(A) the 7900rpm is the magic number on my version of the prop.

I show up at a new flying field and I will use my tach to set the RPM right at the 7900 that I need. I fly all my sequences at this number. The model tends to perform about the same even with going up in elevation or down to sea level using this trick. Basically the curve stays pretty close to the same with changing conditions as well.

The curve below is magic for sure.....?

If I run the engine without the velocity stack the RPM number needs to be about 7700-7800 on the same prop to make the 94db(A) limit and the curve gets raised at the 3 points below in the photo. I would say without the stack these points each get increased by 6-10%. I fly it an tweak the curve to my needs.