If youre also interested in splits, ST is best imo, FS running second. ST focus nexus to maximize Rock defiance procs, there was a short time where yeti shaman had nexus aura and that was amazing. Soulsphere and Rock defiance for a 1 round delay (most players will waste through the soulsphere once they notice it procs), Quagmirrian had nexus aura up until the revamp which I miss dearly. You can also run a fun gimmick construct rock defiance bg as well. I've successfully Spare Parts Earthmover with Clockwork swarm by cliffing CWS after I create chasm and then spare parts my units. Note: It's not so much a troll theme you're playing but Rock Defiance, the elementals and constructs add enough depth now to play them throughout IS.
I just don't see a point in running Heal Mass 3 when you have so much CtE. Angel of Mercy for 80 nora? Ehhhhh