Tell me if I'm wrong. I was looking at the posts on flowable fill and playing in my mind on how we would put it to use. Currently, we set up our base and drive the wall units into the base via dead blow hammer. There is a lip on the back of the block that gets driven into the base (Pavestone) until level. Maybe its just perspective, but wont driving the block and block lip into the base further stabilize the wall? I'm assuming that the flowable fill "sets up" similar to concrete, and wouldnt allow the block to be driven in. Won't this just create a surface that would allow the base course to "slide" off? It just seems like there wouldnt be anything to anchor the base unless you always buried 2-3 courses and relied on the backfill (around the base) to stabilize the base course. Even when you pour a slab to veneer stone, you either imbed the stone into the slab or apply a layer of mortar to adhere the stone to the slab...see my point?