Based on a forum post I made ages ago, these are the levels I would do on Valor Pass (S2 special stages), should it help.
2.15.9-N/H: Decent Recruits, I often do 2.15.9-H with loot tix when burning WE
2.3.5 - Combines the stage along with bosses and enemies, should you still need them
2.6.3 - Best level for recruits and not bad for xp - see my Magic Night post for full reasoning.
2.9.2 - Gave the best XP for the fewest flags - felt this have the best loot, but any 2.9.X levels give good XP.
2.9.5 - As above but more monsters if you need to fill a chest.
2.7.2, 2.9.5 - If you need Stegasaurians.
2.18.2, 2.18.9 - If you need Kirins.
2.11.X - In the end I noticed that the materials I needed appeared on province 11, so I just randomly spread my attacks around these 5 levels.
If anyone can suggest better/alternative levels (with reasoning), that would be great.