edit: this post is full of derp including not reading points levels desired, skip it at your leisure
If you're set on going Sons of the Tempest (never been much a fan of this theme, but that's just me) I'd think you want more Hunters, and since you can get 2 Gun Mage
UAs why not use them? So maybe something like this? It also leaves you with less 'extra'
ATGM that you can only ever possibly use in this theme, which is always a plus
pCaine
-Ace
ATGM
-
UA
-Hunter
-Hunter
ATGM
-
UA
-Hunter
-Hunter
Black 13th
Max Blazers
Not sure if it's better, but more access to brutal shot, ignoring stealth, you get eLeaps in there (not that you're struggling for POW 10s), and extra hunters can't be too bad? Just a thought, it can suck to pick up too many copies of a unit that you can never use otherwise