if your nuts for holding the steering rack in place are the big black plastic ones that come with the kit, and you tighten them too much... even just a smidge.. it will make the servo work hard to center... no matter what servo you have. You can tell by hearing the servo buzzing all the time when at center... and the chassis is off of the ground... tires in the air
DaveW....I love you right about now.....I think that was my problem