Condensing Spell List in Battle

i think ending the Lore list on a non-null entry would be problematic.  

Ah, yeah, nvm. It would only work if the final Lore were blank, but if they've got their full list then it would never exit. Brainfart on my part.

Do you think it's feasible to sort both rows separately?

Like, the left and right columns? It's definitely feasible, but it would involve much more extensive coding and I don't know that it would be to any benefit. You could still run into issues where, say, you have a very long list on one side and only a couple of spells at the top of the other. It also wouldn't be compatible with sorting Lores, so you'd need to run the existing code separately for that.

-- That said, while it would still require separate code, it would be feasible to adjust the initial list build for proper two-per-line sorting and then run a sort to shuffle up a line only if an entire line is blank. You'd still end up with blank spaces if only one spell on a line was missing, and you'd run the same risk of having one very full column and one very empty one, but it would still be more user-friendly than the existing vanilla system.