I'd say give them another week and don't move them if you have them in good spots and if they are still declining then we can probe you a little more.

I'm not a fan of laying them over the sand/crushed coral with nothing to grow onto. I prefer mounting them to a flat rock with room to grow. The Acan Lords I believe create their own skeleton as they grow so they may not be a problem but most of the other acans with "fluffy" heads need something to spread over....

good luck.