Sorry for the slow reply.
I just played with it some more, with my backup radio (race radio is at the next race already), and it is still doing it. It is not as bad as when I noticed it at my last race,but it is definately going past "zero" before it zeroes itself, if that makes any sense. It does it with the linkage disconnected also. It also does it when going from brake to neutral, as well as going from throttle to neutral. After testing it in the buggy, I tried my truck version with the same exact setup/servo, and I can definately tell that the one in the truck is working correctly with no bouncing or hunting for neutral.