I wonder if it would be good to include a nova totem on another shaman after you drop earthbind. That way it stuns them once they are released from the root. Like have 1 shaman earthbind, 1 shaman nova, 1 shaman tremor. Then just rotate it so when you press the button you have 2 tremor totems, 1 earthbind, and 1 nova each keypress.

Something like this...

tt,tt,tt,eb
nt,tt,eb,nt
eb,nt,tt,tt
tt,eb,nt,tt

tt = tremor totem
eb = earthbind
nt = nova totem

The toons that have tremor multiple times would just need ,,, setup in the macro. If your toons are not cc'ed and you can use this it should drop 2 tremor's 1 earthbind and 1 nova. That way you can root them and then stun them with novas. This should help a ton with keeping people off you while you nuke. On top of that you could round robin ts in between to knock them back. It may be good to just setup round robin ts in between the earthbinds. That way you can boot them back, root, and nova.