Joystick Axis 9&10 with more than 2 gamepads

Hi,

We're currently constantly running into a problem where axis 9/10 (that's R and L trigger on an xbox gamepad) will be read as for different players sometimes. My input manager settings and code are both correct (checked, rechecked, and checked again). Googling around this seems to be a common complaint (http://zbegra.tumblr.com/post/46251462120/getting-the-most-out-of-your-xbox360-controller-in as well as some other unanswered questions).

Is there a workaround for this or should I give up on using triggers when more than 2 people are playing?