Perhaps you are already doing this, but when using ABRP, make sure you select the detailed settings display. Then make sure all of the settings are as accurate as possible. For example, make sure your top speed and extra weight settings are accurate.
The better your inputs, in ABRP, the better your result. The car optimizes for fewer stops, while ABRP optimizes for least amount of time. It fits that the car predicts 3 stops to ABRP's 4. But it doesn't make sense that ABRP is predicting more time than the car. Your inputs are probably off.