Most likely lost GA because of totally invulnerable gungans. Yes, I realise it's a very strong defensive team, so I’ve left two most potent and relevant attack teams for them while cleaning the rest with something else. So, went first with Traya lead sith trio + Palp & Vader with Palpatine datacron (all maxed, min R6):
Nihil’s Annihilate did not work: used it against boss Nass, Falanx and the generator itself. Zero effect. I thought only GA’s are immune to it
Datacron did not work: gungan that killed Palpatine did not take bonus turn and die, even though other Sith were still alive. Immunity for the first two turns didn’t work either, but that could’ve been dispelled.
Then I went in with maxed R10 SLKR FO and Sith trooper datacron and:
SLKR brutal assault did not remove buffs
His special had practically no effect
I did defeat R5-6 gungans with either team numerous times, so something is really phishy here.
Thanks!