something you could try: throw your lowpoly into xnormal as both the high and low def mesh and let it bake a Bent normal map once you have that: take the green channel and apply it ontop of your layerstack with the blendmode set to soft light, try 60% opacity and tweak to your liking take the blue channel and put it ontop, then set its blendmode to multiply, I'd suggest starting with about 30% opacity