While I tend to be very fussy about linkage geometry for control surfaces and can spend ages adjusting pushrod lengths and subtrims to get equal surface deflection each way with equal servo endpoint settings, I don't worry too much over the endpoint numbers when it comes to the throttle.

However, I do tend to set up the geometry to give me improved position accuracy in at idle ie. throttle arm has only rotated past being 90deg to the pushrod by a little amount and the servo is about 60deg past "centre". This means a lot of servo movement for a little pushrod displacement (increased resolution) and the engine can thrash around as much as it wants as changes to the throttle barrel position due to engine movement is minimised.

A multi point line curve then gets the throttle to feel right. I also have flight idle set with the trim lever in it's middle position and the volume of the lever set to kill the engine on the landing roll out. I just can't get the hang of using a digital trim buttons for throttle....

Given I used to fly with a throttle ratchet that had about 20 something clicks (I now fly smooth as per heli's) I don't think that trying to maintain good servo resolution at anywhere other than the idle position is of any benefit.