I can sympathize about the tower and the pawns, I usually save those for last.
I find it helpful some times to copy the pattern of the rocks onto a piece of paper, maybe 5 or 6 times, then as you play, x-out the rocks you move, so you don't repeat yourself. Some times it takes as few as 3 rocks or all of them, to get the right balance. It just depends on the right sequence. Try this game at the begining of the level so you're not tearing you hair out at the end. As for the rocks, try far bottom left, middle top, then top right. I think I remember it that way happening once or twice. Good luck.
Edited on 09/30/2008 at 1:47:49 PM PST