Malak is GOLD in conquest generally, especially any time you're being outrun and need to interrupt the other team.
Utilizing JKR's savior ability can also interrupt any enemy TM/bonus turn train and let you get a word in edgewise, as well as GG's bonus turn ability.
CLS, GG, and JKL teams are all very high utility.
All three should be able to beat SK fairly easily.
Also, I generally recommend AA over the thermals/dots, because that damage can't kill them, just take them to death's door, so you can gently nudge them over ;)
I personally tend to avoid ZA, because I don't like giving the enemy TM to take turns and hit me. It's useful in certain circumstances, but not my preferred setup.
CLS, GG, and JKL with AA, especially if you can combine with ruthless swiftness/offense, gets the job done. I recommend combining GG with Nute, for extra max health damage on debuffs, plus if you have a low gear Nute like I do (still g11), he'll die quickly and revive, triggering GG and still potentially allowing you to three star the node once your TM train gets going. The enemy squads will literally melt before your eyes!