Pole 8, rotate the upper block by +1 mrad.
Pole 8, rotate the lower block by -1 mrad.
The + rotation direction is from the x-axis to the y-axis.
The resulting cant angle is 2 mrad.
The center of rotation is the block face at x=0.
This doesn't change the gap at x=0, so the x-trajectory is not affected at x=0.
It does increase the gap at +x.
The field direction on pole 8 is +By.
By decreases with x after the cant angle is introduced.
At +x, smaller By kicks the beam in the -x direction.
At +x, the By field integral is smaller.

x-slope at x = 0: 2.8696e-007
x-slope at x = 1mm: -6.9235e-007

I1y at x = 0: 1.1412e-007 Tm
I1y at x = 1mm: -2.7534e-007 Tm

Sensitivity:
a cant angle of 2 mrad changes I1y by -3.89e-7 Tm as x changes by 1 mm