First off, congrats and thank you for finishing the project.
I found a possible error in the JP version that made it through the translation, Elchika's Recovery Dance skill has an element (ID5, which corresponds to Shoot?, all other healing skills that I checked is ID0/No element) attached to it, allowing you to cut the amount of healing done. But, I think it has one of the better healing formula for how early you get it, so might be intentional?
Discovered it by manually going through the skills.json on both the TL and JP versions.