Knightfail. Lvl 20

After like 50 attempts I was able to clear the first tier with Appo at G9 (so no Kyros needed) and without either of his zetas. You will likely need his Omega's on his basic and middle abilities though.

Best advice I can suggest, focus potency and speed for mods. I only had 229 (+79) speed and 60% potency but higher values would be more consistent.

Against JC: Start with Appos mid ability, hopefully stun but doesn't really matter, then more or less just use basics till he's defeated

Against Shaak-Ti: Ideally Vader will go first and you'll use his special and hopefully get buff immunity applied, then use Appo's middle ability and get the stun. Knighttrooper will always just use basics. Ideally you'll be able to defeat her by just using basics with Appo too but, if Shaak is using her ability to heal too often, as soon as you can use the middle ability on Appo to stun again do so.

Against Kelleran: Just use basics. He doesn't really do a lot of damage on this tier and you NEED your cooldowns ready for the final phase

Against Jocasta: Here's where it's really RNG dependent. Ideally, Knightfall trooper will be going first. If Appo's first, use his middle ability and pray for a stun. If Jocasta's going first Pray Appo is next and lands the stun. Then use Vader's special and pray for the buff immunity. The reason for this is to make sure Jocasta doesn't gain speed up. Then just use basics with knightfall and Appo, making sure to use Appo's middle ability once it's off cooldown to hopefully stun again.

Even if you do everything right against Jocasta, it'll depend on what abilities she uses and when. You NEED to defeat her before she switches to the rifle. If she pulls it out, just reset then and there. Even if you're lucky enough to defeat her in that state, she'll just throw her rifle and defeat your entire team ending in a failure because your units won't have enough health to survive