You'll be limited in the amount of drop by the control arm hitting the frame. The easiest way to get lower after you've taken the bumpstops out is to swap in a set of dropped spindles for the stockers. Other than that, be prepared to start notching the frame by the control arm pivots, above the tie rods, and near where the bumpstop used to hit. You'd also likely need to modify the lower control arm to drop the lower end of the Shockwave down a bit.
Also, be sure that the top plate of your Shockwave doesn't come into contact with the outer edge of the spring pocket at all, and that the lower mount is bolted to the topside of the control arm instead of the bottom side.