Lets face it, when you're landing over a jump, you ARE coming downhill! If your lower leg position is secure, and maybe a little forward of normal, just adopt a normal light forward position and LOOK UP!
It's when you let yourself watch where you are landing that you roll over the shoulder. Once you are committed to the jump, keep the momentum going, don't slow down and ride on at the next one.
(I'm assuming you are jumping fairly small jumps at this stage - for big ones I agree, sit back!)