Manipulating Dino Counts: ###################### The order you clear the floors on the ship actually changes the amount of dinos on the later floors. The game determines the dino count of the current floor when you open the elevator door to that floor for the first time. You won't save much time visiting B2 before B1 since you can't clear it on your first pass anyway, so we'll focus on B3 and B4.
In my run, I went to B4 first which results in 30 dinos instead of 25. This floor is wide open and packs all the dinos together for easy kills. Then moving to B3, it only spawns 13 dinos instead of 18. I found this to be easier since I didn't have to snipe 3 spitters in the first room and I didn't have to walk quite as far to reach the last dino. The dino count is determined by how many you've killed, so it can vary between 13 and 18 if you partially cleared a floor. Do NOT open both doors to B3 and B4 without clearing the floors, otherwise you'll be stuck with the max amount of dinos!