If we trim with a new 1.12 seed that should fix it – as long as the new seed isn't ocean in that sector. I'll help with water fill-in/removal to get the ink farm back up to speed.
Speaking of.... 1.12 seems pretty solid, is there a reason we can't just update to 1.12 now and trim later? I get that ideally we'd trim and start a new world on the outside, but maybe that's not an option right now.
Brad's texture pack looks great and I'm itching for some weird colored sand and glazed terracotta.