Hmmm, maybe but I doubt it. I don't even bother to make a pointing model at all with my G11 mount. Plate solving should get the mount there on its own. Do you have a "settle time" defined for your mount? I have found it necessary to have a settle time of 20sec so that after a slew the mount stabilizes before the next plate solve frame is taken. Also, I would increase your attempts to 10 or so. See if that gets you closer.
Also, do you know what epoch your equipment is using J2000 or Jnow? They should all be the same, and preferably J2000. But that's getting a bit beyond my expertise.