Hello.
We generally do not recommend connecting regulators in parallel; you can find more information about why in this forum thread. You might consider a more powerful regulator like the 12V, 15A D24V150F12. Alternatively, you could split your load up between multiple separate regulators (e.g. something like one regulator for the Raspberry PI and sensors, one for the motor controllers and motors on the left side and one for the motors and motor controllers on the right side).
Brandon