Tier V of the Jar Jar event is too hard

I felt the same when I bought the darth revan bundle and struggled at teir 5 and teir seven even though those cheractors surpassed the minium for the battles. the way I beat it was i put zadia on one of my chractors and reliced them up to fight. I also watched a few hours on how to beat it and took over 10 tries. It just takes practice and you will eventually get there.