Hi, the maximum current for SC16A on servo power part is more than enough for 16 servo motors. I have personally tested it with 16A load continuously for half an hour and it is still working. May i know what is your application? Actually 10 servo motor not necessary to consume more than 6A. My personal thought 6A would be enough for 10 servo motor.
Another method that student usually do is connect a 7805 voltage regulator on EACH servo motor's power provided you use Lead Acid battery or Lithium Polymer Battery.