I always use Wedge, Biggs, Lando, which of course lose their protection, but no health. In the easy nodes before the hard ones (6, 11, 12 I think), make sure that the cooldowns are down at the end.
I save my Boba and STH for the last node and use atm Sun Fac and GS in nodes 1-11 instead. When GS dies, I have JC or Ahsoka to replace.
I only ever lost one time on #12, where the opponent also had STH, Biggs and Wedge, but 10 lvls more than me and Wedge 7* and me 4*.
All other times it was ridiculously easy.