As said above, set the SAG by looking at the movement of the shock, not the air you put in. The amount of sag you want is a bit of personal choice as different bikes / riders will have different needs.
For me I go for 15% Sag, as I do a lot of trail riding, not DH all the time. But you need to experiment to see what you like and what suits you.
For just jumping you really need to get the pump on takeoff right, and the rebound. I dont think the sag will matter just for that.
But, the coil shock is much better for me – it dosent ramp up (get harder) at the end of the stroke like an air one does. So it behaves the same way all the time. The CCDB also allows lots of fine tuning so you can get your bike to feel just right if you have the time and patients to do it methodically.