Scott the problem you describe with the car on the springs and a down demand was a very hit or miss problem but one we would see on certian cars. What we found was the cam hitting the switches (a poor desing for sure) at such an angle that the switch could bounce and come back and make up again thus causing the car to go lost and pick high speed down , blow thru the floor and stay there. The solution was to readjust the cam where possible and to stack extra contacts on the direction switches to add x-tra spring tension.
