Mouse Wheel for Throttle Issues

[Pikestance]

Hey,

 

I use the mouse to look around and I find it very convenient to use the mouse wheel for the throttle. However, the problem I have is that I cannot figure out how to get the throttle to go up with smaller increments. It goes for example from 60% to like 66% or 63% to 68% and the next jump is 77 or 75%. This is one click on the mouse wheel. I do not expect a 1% increase, but something smaller, like 2-5% would be better. I tried adjusting the mouse wheel in both windows (going both per page and by line 1- to max) and in sensitivity settings in game, but there wasn't any change in the incremental increase/decrease. I am guessing there is some variable somewhere, but I couldn't find one and I am not changing anything unless I know what it is first.