It is not clear from your post, but did you measure 5V from the Maestro’s power rails while the Maestro and adapter were both connected to your system? If not, can you measure the power rails and confirm there is servo power on the Maestro? Please make sure that your Maestro, the weaker servo, and power supply are disconnected from your food hopper system to keep the test setup simple.
Just to clarify, when you tried moving either of your servos, did it sound like they were trying to move but could not, or were they not responding at all? Can you describe the on-board LED behavior after you tried moving one of your servos?
Also, can you post your Maestro settings file to see if there is anything odd about your settings that could be causing the problem? You can save your settings file in the Maestro Control Center by selecting File->Save settings file.