Okay, so i was scared of not being able to get all 24 stars, i did map 5 in 4 runs due to rng, 6 and 7 in the first try and map 8 took me around 3 or 4 tries, thankfully.
Since my team's speed whas somewhat similar, i sent my strongest and weakest team south, then 2nd and helper up and my 3rd team for the enemy in the middle. Main team could , albeit barely, kill everything including the annoying 50% bros with 1 orr 2 units surviving with team 4 at full life ready to scratch the final boss.
I couldn't make my team 3 slow enough, so it ended taking the north heals, and again, scratch the boss.
Finally the helper got to boss, killed it, used my team to tank the insects, and went for the kill to the weakened final boss. Funnily enough, they got to the final boss before my main got to the brothers, so my 3* run felt kinda anticlimatic with the normal music instead of the boss theme.