Hey thanks for the reply
I'm still confused though, as to how trim and subtrim is different. On the outside they both turn the wheels left and right. My radio has something called ATV, which allows me to adjust how far to the left and right I want the servo to move, then there is also trim and subtrim. When using it, I realize that the trim moves the servo in much smaller intervals, so it's better for those minute changes needed, but in the manual, I get the impression that the subtrim is used more to "center" the servo, like if you wanted to get that perfect 90 degree link, and then the trim would be used to get the wheels straight while the ATV will give you control as to how much to the left and right you want the servo to move.
Is my thinking correct?