Exactly! You can defy gravity a bit if you use epoxy (and superglue on the surface of it) to hold things together. That will allow you to lean the rocks out further if your base is sturdy enough. Slide the rocks incircles in red to the left leaning out and floating. Then you’ll achieve angles that aren’t vertical on the ends of your stacks (see yellow lines). Again, you’ll likely need epoxy to do this.
My remaining critiques are that your structures a a little too top heavy, they are too similar in size, I’d probably angle each stack a little more, and I’d glue in rubble rock between the joints when you get everything in place (see blue highlights). That will round out your caves too.
Please don’t take this as negative criticism. These are just some things I’d do if it were me.
