From my experience using Ewoks the most effective team is Chirpa (L), Paploo, Logray, Elder & Wicket
I’ve tried a lot of variations but that team seems to gain the most advantage from their TM boosts and overall utility...
It requires a lot of investment with zetas and gear to make them really shine... probably not so much for critical damage mods (especially since you need Jawas for that)
If you are going to use Ewoks then go all in or not at all... I use Wicket at just 5* in arena and still can take #1. So getting him to 7* isn’t crucial...