I am using Queen Penth for vampiric strike and i get close to 70% damage, one issue i have is when the Snake does her skill attack on my Queen Penth she dies instant, Snake does a 85k - 90k skill on my Queen Penth while Queen Penth HP is around 83K she dies. So looking at minimizing the Skill damage Queen Penth takes and pushing her HP a bit before i try again.

My formation goes as below

Queen Bryn Main X
X X X
Herza Adam Queen Penth

Sub is Ahmose and should replace main.