I used to use a setup station where I'll link a video below, in fact I'm willing to sell the exact same station if someone wants to buy it, but here's the method I use now:
I set the adjustable turnbuckle between the servo arm and ackermann bar so that it's perfectly center using calipers to measure/mark center of ackermann and center between steering posts. Then I make sure the thread lengths are identical between left/right steering turnbuckles. I will then track the car straight and eyeball the toe where I prefer anywhere from +2° to as much as +5° toe out depending on car and handling. This is a driver preference, there's no right/wrong setting.
I almost never go with 0° toe which tends to make the car bounce and lose control on jump landings. I will increase toe out if I need more off power steering assuming max steering throw isn't enough. Car should be able to do a figure 8 loop within a 3'x3' square for a 1/10 car and 4'x4' square for a 1/8 car. If you can't make a sharp turn in this box then chances are you haven't set your end points or don't have enough toe out.
1/10 cars tend to lose ability to track straight after wall taps and wrecks, I have learned to use my thumb to adjust sub trim during a race as the car is going down the straight with the trim buttons on the grip without having to look at the controls.
Check the exposed lengths of turnbuckles with a caliper between races, what tends to happen is the ball end threads start to strip causing the threads to shove deeper into the ball end, it's best to replace the ball ends and learn to drive cleaner.
