Ships for tier IV challenge

Hi, guys! A novice needs your advice:) I did not realize eralier that for tier IV and V I would not be able to mix LS and Ds ships and only today stumbled upon it. So, I need to adapt my farming strategy to this new condition and want to ask for some advice. I run the following ships now: 4* Acbar, 4* Phantom, 4* Ghost and 4* Biggs as my lineup, 7* KRU and 4 * Young Lando as reinforcements. This team let me to keep my arean rank in top5. My plans:

1. Level up JC Starfighter to 4* to pass tier IV Acbar's challenge, just as the fastest possible option now.
2. Unlock Slave (4*) and level up ITF to 4*, so I can get 3 DS ships. Working on it currently.
3. Would it be a good idea to run for Geonosians? Soldier and Sun Fuc fisrt, to get 5 ships for tier IV Tarkin's challenge. Any suggestions and corrections are highly appreciated!