Hmm.. okay I see what you're saying. Ironically my last design had two big rocks and it made the tank feel small so I broke them up into these guys. I'm going to make a pile a little right of center and then cover it with ferns so it looks like one big rock.
I'm going to avoid having it symmetrical as it is now too.
Any other suggestions I would love to hear them! I've been doing some reading on aquascaping, but its proving challenging to actually apply it to my own tank.