Thanks so much.
I'll try to give some spaced out hints with specifics in strike through to give people a chance to avoid/limit spoiling something they want to figure out on their own.
I'm sure you've tried/noticed these things, but you need to put most of them together to win consistently.
1) You'll have just gotten a new strength die. A 12 strength + 11 constitution (or more) main character (MC) has a lot more leeway than someone with lower stats. If you follow all these steps, you don't need a perfect 12 12 roll, but it can cover for not having all the points addressed + make victory more consistent.
2) Both enemies do edged damage. Loading up your bruiser MC with Scale Armor will let them do more damage for longer.
3) The enemies have different armor types. Equipping your MC with multiple weapon types will help you deal the most damage (this + step 2 requires you to use fighter abilities to gain an extra weapon slot); you won't have space for off-hands + armor + 2 weapons, so grab the biggest two-handers of both damage types.
4) Plan for the enemy knock back. If you have no movement abilities, Lia should have a melee weapon to maximize her damage, as bows do reduced damage from the frontline. But the easiest victory is to use the three earlier clues and have Lia use the duelist specialization with a knife so she can help tank damage.
There are some other tricks that can be used to achieve victories, though the hints above give the most consistent path to victory. Namely, the Kite Shield or Lightning Potion can be used (with the other hints) to get a decent chance of victory, but not as consistently as the above method.
Hope this helps.