Lots of options to shoot for. There is a balance between good handling and good landings. For cornering at speeds you will want to go soft, but with big air you need to go stiff. I think you've already figured out that you need to be somewhere in the middle. And I'm also guessing that you're already doing what needs to be done to answer your question. Trial and error. Shock setups, for all kinds of conditions, can be hit or miss. The learning curve is huge. Aside from trying different setups, keep a few things in mind. Oil weight and diaphram choice affect compression more than rebound. Spring choice affect rebound more than compression. A bad setup might be 80 weight oil with a two hole diaphram and soft springs. On landing the shock will compress slow because of the heavy weight oil moving through only two holes. The weak or soft spring won't get it back to full extension fast enough for the next bump. I could go on and on about all the different options, but I think you get the picture. So, play with oil weight, spring strength, shock mounting position (upper and lower), and pre-load. Good luck.
