Okay, I think you said it just then. You said it lifted untill the rear bottomed out. That is the problem. At that point the suspension bouces and and you loose it all. It sounds like the coil overs are not set properly or the springs are too soft for the car. The coil overs should be set so that they are mid stroke when the car is setting still. If the springs are too soft, this will not be possible. Also remember, if you reset the ride hieght to correct any spring problems, the ladder bar geomtry will also change. If if fact the springs are too soft or set too low and you raise them, the bars will be pointed more upward, and will hit the tires less. This might not be a bad thing if it is bottoming out rihgt now.