It looks you are using the 24-Channel version of our Mini Maestro controller. The output pins on that board are divided into 4 separate banks of 6 outputs and, between those banks, there are pads on a 0.1" spacing that are connected to VSRV and GND. You could provide additional power feeds for the servos at those points. Also, if you want to use separate power supplies for the 4 banks, the trace for VSRV on the bottom of the board can be cut at those points, as shown in the in the following picture:
What kind of behavior are you seeing at start up? Do you have your channels set to "Off" on startup or error in the Maestro Control Center software? I have noticed that some servos tend to twitch a few degrees when powered up if they are not being sent a position. It might be better to specify a "Go to" position for startup and have the servos return to that position on shut-down.