This is almost a philosophical discussion.
I've settled on leaving the pitch curves the same in all modes. 0 - 100%, same with the throttle curve in normal mode. In idle up my Throttle curve bottom point is at 50% and I mirror the curve so it looks like a "V". I run a governer, so if it shuts off, you can really hear the jump in RPM on the engine. If you don't run a governer, you need to mess with the low point of the curve to get a good head speed while unloading the head (0 degrees pitch) and adjust the curve so the head speed is reasonably consistent throughout the range.
In doing this, you need to adjust the heli mechanically so that everything is 90 degrees at mid stick and the blades are at zero degrees pitch. This will give you even throw both up and down.
If you have too much pitch range (or more than your comfortable with), adjust the top and bottom of the pitch curve and try and keep the line straight between the top and bottom points. ie. Top point = 80, Bottom point = 80, all other points create a reasonably straight line.
What's nice about the symmetric straight line curves (oxymoron???) is that you only get a head speed change when flipping the idle up switch. If you have to do an unplanned auto, you don't have to go searching for your hold switch to get an appropriate amount of negative pitch.
Good Judgement comes from Experience. Great Judgement comes from Bad Experience.