My call of elements drops everything I need - except earth totems on the last two shaman. I then (unless I'm getting rushed like crazy, or need to move my totems) use a staggering macro to have three shaman drop tremors a second apart (but if I don't get a chance - at least I have one totem up).

The problem I had was movement and re-laying the entire totem stack during matches - it would overwrite my staggered tremors - so I no longer have the last two shaman drop earth at all. With big positioning changes, totem stomping, or just long matches in general I sometimes re-lay the entire stack. Usually I'll still have my original staggered totems in this case. However I usually refresh those when I get a chance, just in case.