Wookie,
Your 1.0 scape was a rock wall which as you have noticed is uninspiring.
Your 2.0 scape had two virtually identical regular cone shaped islands.
I think you can improve 2.0 by
A. Different sized islands. One island can be 50-100 percent bigger than the other.
B. Island shape. Make the islands less symmetric. Have benches, a secondary peak, a saddle or something.
C. Smaller islands. A few small islands of different sizes might give the impression that your big islands grew organically.
Of course, there is what one wants to do and your constraints. We want rock work that is open. We want hiding places for fish. We want stability. We need places to put the corals. Our rock has limited shapes. So you do what you can.