I too have similar setups. I have tremors and grounders on round robins and different totem setups for PVE, PVE Bosses, and PVP.

What I find that if I back up off the training dummy I get the same error, invalid target, and the shamans just sit there. When at point blank range the macros work fine.

I might put in a switch like /cleartarget or something before casting. I just need to tweak it a bit.

Does ToW stack is that why you use 4x?