I too am always messing about with my rock layout.
At the moment my rocks are on the right of my tank around the weir, but they are 2 layers deep.
I think that configuration gives more gaps and hiding spaces for the amount of rock used.
Also, as mad as it may seem, I think the fish enjoy a bit of novelty and exploration of new things!
I do realise it sounds bonkers, but as I am unable to work I spend a lot of time watching my tanks.
When, for instance, I put a new ceramic artificial log in my tank, after a few minutes all my smaller cichlids swim up to it to have a look.
Then they swim through it and swim in and out of all its holes.
It really reminds me of when I was a child and I put a new toy into my gerbils cage.
Iam fairly sure that Iam not imagining it, and none of my other fish in any of my other tanks display the same kind of behaviour.
It is just that cichlids seem to be really curious.
So I think changing their enviromen toccasionaly is a good thing for them
doris