OK, when I calibrate using the GAP IID , .
I follow the procedure, of setting the height to std.
Then it tells you to measure a given wheel ctr to wheel arch using a tape measure, and adjust on the GAP IID screen to adjust up or down until the measurement on the tape measure is the correct distance, then you save that and move to the next wheel etc etc.
So you have to physically measure the distance to calibrate correctly,
Are you just pressing a calibrate button on the diagnostics and expectigin it to hit the correct height by itself?
Cheers