You got to go through the long way to get 5FG reward. Lost the least girls, usually only one, on the deck team using counter reducing enemy skill 60%. Neutral is toughest. A Kerria team lost all members except Kerria
Soapwort, Mistletoe, Apricot, Burning Bush, Anemone is my best so far
Got the Blue and the Red to go
Edit
Subbed Iberis for Burning Bush on blue-wiped them out with no losses
Those 25 FG rewards is nice