http://image.prntscr.com/image/8f1ca266fc4e47509a73f395f1873b75.png
I started my first attempt on the zeta challenge today (tierIII ability mat) and I must say the Tarkin farm was a probably waste. It is quite easy to 2* at first try, with Tarkin still lvl 53 and Executrix lvl 35. 3* should definately be possible, and with that 4x speed it's also okay to auto it.
Team:
Wedge, Biggs, Boba lvl 80, g10. Sun Fac lvl 80 g8 (5/6 to g9), JC (6*) lvl 74, g8 (5/6 to g9).
Ships:
Wedge 78, Biggs 78, JC 73, Slave 75, SF 73 (1st try) / GS 73 (2nd try)
Reinforcements:
Ahsoka, CS ARC, GS (1st try) / SF (2nd try)