I researched a lot before buying my Elite Drivo. Picked it because it includes an actual torsional strain gauge, unlike most turbos, Suito included, which makes them cheaper. Some brands have a more consistent power approximation method than others - everyone loves the wahoo kickr but I understand it to just be an optical speed sensor with a correlation calibration at manufacture that holds over time.
If the power number on your Suito used to be different, it may be down to a change in room temperature or airflow. Otherwise, it's a product cost issue. Sorry not to be more optimistic.
That said, you should be able to edit a calibration offset in the PC program "Elite MyEtraining".