RoboDragon

This is to be (aka not done yet) an animatronic dragon's head.  It currently has 3 PIR sensors to act as eyes.  My goal is to have it interact on some limited level with people.  The idea is to have to head turn right/left towards the most recent movement, and center itself on the 'target' and perform some other entertainment behaviors (open mouth, blink lights, etc..)  So far I can get it to turn towards movement on it's right, but I seem to have a problem with the code to turn the other direction.  I know the sense routine is working (I've checked the output), but the movement routine has a problem I was hoping someone on LMR can give me a hint to get me back on track.  Yes, this is my first 'robot'..  I have no plans to leave the microcontroller imbeded, so I'm using an Arduino.  Here's the function I'm having problems with...

void moveHeadNeck() {
  int alittle = 1; // a small move to one side for fine tuning
  int alot = 2; // a big move to one side when something new is noticed.
  int cPos = neck.read(); // current position of neck servo
  //    Serial.print("cPos:"); Serial.println(cPos);
  //    Serial.print("cPos-1:"); Serial.println(cPos-1);
  if (motionCenter==true) {
      if (motionRight==true) {
        // move a little to the right
        neck.write(cPos-alittle);
        Serial.println("Motion to the CENTER/RIGHT");
      }
      if (motionLeft==true) {
        // move a little to the left
        neck.write(cPos+alittle);
        Serial.println("Motion to the CENTER/LEFT");
      }
    } else { // motionCenter==false
      if (motionRight==true) {
        // move a lot to the right
        neck.write(cPos-alot);
        Serial.println("Motion to the RIGHT");
      }
      if (motionRight==true) {
        // move a lot to the left
        neck.write(cPos+alot);
        Serial.println("Motion to the LEFT");
      }
    }
}

This moves to the right (adding) just fine, but refused to turn to the left (subtracting).  Any suggestions?