MP9 TKi2/3 Calibrating front toe angles

[Raphalite]

Finally got round to dialling my MP9 to my local track at Herts but left scratching my head when it comes to accurately measuring front toe angles.

I have the exposed section of the Steering tie rods set equally on both sides at exactly 28mm (as the manual suggests), however I am getting inconsistent readings when using my camber tool to try and measure. Front tread width is set up as long with 11 deg of skid angle if that helps. Front camber is -1 and I am using the inner of the two upper arm positions.

Figuring I am missing an easy trick, Any tips out there from MP9 owners? Ideally I want to play around to gauge which works best for me, but not knowing what I have as a base setting is frustrating.