HELP: Voltage Drop

[pujan824]

When testing our robot, we were getting a voltage drop to 6V when going over the obstacles. When going over the carpet we have been dropping voltage to 9V.
Our robot has 6 8" pneumatic wheels powered by 2 cims in a toughbox mini each controlled by a talon srx
It has 2 window motors for lifting our arms each controlled by victors
2 mini cims for shooting each controlled by talon srx. (we are planning to swap these out for banebots RS-775 or 775pros )
We also have noticed the front CIMs on our drivetrain getting really hot.
Our drivetrain does not have the center wheel dropped.
Currently we do not have the time to create a center wheel drop.