Would agree with both above comments. The smaller bore will effect the pump current draw due to changes in how the hose expands and pressures. The controller is cycling the pump because calibration is to low for the new set up.
The suggestion is
1. When running auto cal, Set the flow rate to your preferred value, if you can safely stand the pole up and run auto cal, Cam value will likely come out higher than 26.
2. Manually increase the cal value by 10 from its current setting
Depending on your preferred flow rate a cal value of 50 or so is fine