Drivetrain help

[Gearheads1]

We were so hopeful, six 8-inch pneumatic wheels from Andy Mark configured in a drop center, about 1/8" being directly driven by a CIMPle Box with 2 cims on each side, front and rear tires chained up. Our hopes were dashed when it pulled the batteries way down and refused to do much moving. We loosened chains, thinking maybe there was some binding, but not much better results. We are troubleshooting this, and the most likely remedies we've come up with are to lower the center wheel some more or switch to omnis on the corners. I read somewhere that direct driving any wheel from a CIMPle Box is a bad idea because you lack torque. I'm wondering if the gering may be our primary problem that we could correct by not direct driving and using a smaller give on the CIMPle Box. We currently have 26 tooth gears on each of the wheels. Thanks in advance for your insight. Hope all of your builds are going well.

Brian Holmgren