I think it's Change-Itus. I used to suffer from it in the early days... like year zero - thru year 5 or 6. it wears off by years 10 to 14 though... you learn not to screw with it...
Davis suffered from it to. I'd go to the nursinghome to remove those plenums from the tanks, and we'd remove all the rock and inhabitants, and do our work. When done, we'd take turns (4 tanks) putting the rocks back... Since I didn't want to spend all night aquascaping (already past 12am and all). He always seemed to like how I put the rocks, and I seemed to like his placement... yet we were never happy our selves.
Worse, we visit and look at other people's tanks and we like theirs more...
I've finally settled in with it's gonna be what it is, and the important thing is the corals.
J
ps. I fixed it by building multiple systems... then you just dont have the time.