That 7mm adjustment has me puzzled. You basically adjust something (a distance) while expecting something else (a spark). If the sensor is slightly rotated in the bracket, it will read the field from the magnet differently.

The best way is to find the TDC with your caliper, then increase that distance by a fly's hair and adjust the sensor position so you have a spark when the piston hits the caliper when you rotate the prop. With this you look at the direct end-result and not a distance. This method is described on the Flakon website by the way.

Ben