A couple of points, a single ragebridge might not be super happy, using one per scooter motor would be better. As a general rule, stay away from sabertooth escs. They are fragile as shit and will most likely break as soon as they see combat.

Another point is that you have two 5s batteries, presumably to give 10s for the scooter motors... ragebridges are 8s max.

Scooter motors and robot power vypers are a proven combination though so you may want to look into those as an alternative.