Hi, RC & Hood
Gecko's Limit Current to the Amp.value you set them to for Each Drive, Let's say you set them to 4.0 Amps.
At zero speed the current is 4 amps, The Voltage is Low across your servos, As you increase the speed of your servos the voltage increases keeping the current at 4 Amp's.
Theres really no need to use the Lower Voltage Supply.
You Just Need to Limit the Max Speed/Velocity to the Z Axis Motor, To keep from exceeding the 48 volt Max .
Don't Punish the X and Y axises.
Just a Thought, Chip
Hoiod : Spit out that Gum, Get a new piece, You wont need to chew that hard, Your making my Neck Hurt.!!!!!