If I am understanding you, you have made the left and right steering links unequal lengths? The left and right steering links should be equal. If the ackerman plate is not centered when the servo is centered, use the sub-trim to center it and the on the fly trim to make the truck drive straight. In an extreme case, I have had to alter the length of the small drag link to center the ackerman plate. But the links from the ackerman plate to the hubs should always be equal, if not the steering will be funky
The steering links are definitely different lengths now. One is about 1mm longer than the other. With the links the exact same length and the ackerman centered one front wheel has toe out and the other wheel points straight. I took the links off, remeasured them and reinstalled them but same thing, one wheel doesn't point straight. Not sure what to do as running the links at the same length doesn't give me straight wheels.