Even with lift, your shocks/strut can be too short. I'd measure the axle to frame distance (or coil height, shock length, tire to fender distance, etc) to find the static height. Then lift the frame with a floor jack till one tire, front or rear comes off the ground. Then remeasure the exact same location (if rear tire comes off ground, measure that only, no need to measure front, same if front comes off ground first). This will tell you your droop at that measured point. Then configure a better way to get more droop. Is your sway bar connected? Are the shackles pinching the bushings?
Do you know that the Sami has minimal droop due to the short length of the leafs and shackles? The shackles design is to lengthen the leaf during the suspension's cycle. Thus the expandable shackles work best for a cheap droop. Don't forget longer shocks, watch for brake line stretch, and ds being too short.
As for your comment about tippy. If you have a tire in the air, or a tire on the ground with 2' of suspension droop, tippiness feeling comes from your body's center of gravity wrt the vehicles center of gravity wrt to the vehicle's load on whatever axles/tire, etc. It won't matter either way. Try riding in one of your buddy's Jeep and get him to twist it up to lift a tire. You'll have the same feeling.