I think I like the second attempt best.
In the current setup the largest rock leans forward a bit too much creating shadow across the front. That can be fixed by bringing the light forward, so it's not really a big deal. If carpeting with hc I think the smaller rocks will need to be lifted up (to avoid being grown over). So your current scape could would nice, but I still think the second attempt (post #8) looks best.
If algae becomes an issue I suggest bigger water changes. When drained (close to the bottom of the rocks) paint the rocks with hydrogen peroxide (3%). Wait 10mins after finishing painting then refill the tank.