Two different things going own here. The first issue with traction problems in the rain has to do with the stiffness of the suspension. In low grip situations you need a softer suspension to load the outside tires more. The stiffer the springs the less load transfer.
On the second issue that is a result of the dampers not being able to control the forces of the springs over rough roads. Try stiffening he rea damping to see if it helps. If I remember correctly you have cheap coilovers on your car which a likely the issue.