All the things
Yes, that's what I suggested. You'd only need one group to shoot her up 30 levels. They should be killable with Dancing Flames though; no need to waste the L4. She only actually needs 10-15 for her to survive, but more levels help for escapes. By the way, in case you missed it, I believe the formula for Let Go to appear are as follows:
if (maxLevel(party)>maxLevel(enemy))
if (levelSum(party)>levelSum(enemy))
Let Go;
The notes I posted a few pages ago are outdated and no longer the notes I'm currently working off of; I will post my updated notes soon. I also encourage you to stop importing S1 data since it could make some unrealistic expectations.
Another thought: if you're just using Jowy to demolish Double Head, Kinnison and Shiro are completely skippable. Reducing party size will also help to shorten the killing off process where necessary. Still something to investigate further.
if (maxLevel(party)>maxLevel(enemy))
if (levelSum(party)>levelSum(enemy))
Let Go;
The notes I posted a few pages ago are outdated and no longer the notes I'm currently working off of; I will post my updated notes soon. I also encourage you to stop importing S1 data since it could make some unrealistic expectations.
Another thought: if you're just using Jowy to demolish Double Head, Kinnison and Shiro are completely skippable. Reducing party size will also help to shorten the killing off process where necessary. Still something to investigate further.