Throwing Problems/Motors

[stretch851]

We are having problems getting the throwing arms to move with much speed at all. It seems to be like the Motors aren't strong enough even though we know other teams have similiar setups. We have 2CIMs and 2 MiniCIMs hooked up, and have tried testing with out the arms and the no load speed of the shaft seems to look more than strong enough. Are motors attached on each side are attached with pulleys to 3 feet up, with a hex shaft across the hold and spin our thrower arms. Our arms weigh approx 5 lbs. Also, we tried running the arms without the ball on only two CIM's and it flipped with a lot of speed. However when we hooked all 4 motors up, it could hardly raise the ball 6 inches. We have already checked to make sure all the motors are driving in the same direction and labeled the wires, so it must not be a wiring issue. We think it may be a gearbox ratio( 2 Toughbox mini's with 8:45:1 ratio) issue, however we are not sure. Any ideas?