It depends on HOW it's bouncing. If it's bouncing around on the springs, then you need to go up in oil. However if it's bouncing around on the tires (ie. tires coming off the track) then you need to go down in oil. In your case it sounds to me like you're probably having more wheel bounce. In that case I would try going down some in the back.

If you can't find the proper performance in oil (either by going up or down) then it's probably your spring rate. You might be running too hard of a spring rate.

Usually when it comes to pistons and pack, you're going to want to look how your landing, not how you're coming off the jumps.