I'm Ewok Master .... just kidding, but I love them and they are my favorite faction. Here's my advice.
If you don't have Wicket or Logray, then the team is really going to struggle in harder events.
Chief Chirpa should be your priority for the omegas and he must be your leader. Ancestral Secrets provides health and health up over time... You don't need his Bounding Strike at max, its ok, but not essential. Tribal Unity is a must though. Many of the ewoks gain abilities or share abilities when they are called to assist. Tribal Unity does that. If you can add a Zeta, his Simple Tactics are insane as he starts pulling in assists over and over from every ewok every turn.
Elder is the driving force behind the team and the most critical. He needs as much speed as possible, like in the 230 range... which is hard, but doable. His tribal healer and Power of the Forest bring your entire team back to life over and over. Omega these if you can!!!!
Teebo only needs 1 omega on Steal Takedown. Pump his potency with mods as high as you can and then use him to knock people's turn meter to 0. He can beat the rancor almost alone eventually... but you need Wicket to trigger his stealth.
Paploo is a beast, but the worst of the bunch in my option. Many people love him, and when he is fully decked, he is sooooo hard to kill. But since you don't have wicket and you can't omega everything, mostly just max him but ignore the omegas. Speed should be avoided here too. You want him slow. He needs to taunt, and stay taunting. When he attacks, he loses taunt. Just keep him back and taunting.
Scout's Rushing Attack is where the omega needs to go. If you can tap the others, great, but Rushing attack will call an assist... If Teebo is called, he moves turn meter from the enemy, if Paploo assists, he they both gain Defense up. Later, Logray provides an assist bonus too.... and logy should replace Paploo....
Hope this helps.