Speaking of equipment here is the video vs mine:
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Vhala is okay but I picked up the Sanctity Plate early and along with an assault helm and barrier pin does that bit more damage. I added in the Massive Unbow to my game but you should still get the Lean Unbow when you can. That'll last you till end game, about 11k Sx. I gave the heirloom pin to Aka as that increases her Luck.
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I upgraded Robin with an Assault Rod and I find her using the Unperson charm instead, as the Circlet goes better to Carina I think. Give her the mage cap and robe and you're good.
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Riala I argue is in need of that +25 defense offered by the Sylvan Glove. The vibe gives her mast+ and the Stenai is perfect for her being focused on magic. The vibe can be found in the ruins mid chapter 3. Riala and Qum should never use whips as a rule of thumb, unless you're desperate.
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Carina really needs the Quick Rod and Savant's Cloak. I watched the vid and the +140 with these items make my heals 3,000+ while in the vid they're only doing 1,900. Not to mention that +90 Agi means she can usually heal before an enemy attacks.
You have 170k Sx at this point and I'd argue it's worth spending 21k on the Savant cloak for Carina as that'll carry you through mid chapter 3 when you go to Theltiar to the start of chapter 5 when you can pick up the Saint's Armor for her request.
I could argue item comps all day. At some point, you should buy equipment for characters and not just hoard Sx. Durge axe for Hilstara for example.