I decided I'd just give things a tiny refresher and threw 1/2c kelp, 1/2c neem, 1/2c gypsum (for the sulphur mainly), 1/4c blood meal then mixed that all in with a handfull of turface and ancient forest and a good bit of worm casting and biochar. Tossed that in a tote with a few handfuls of the original soil batch then give it a good mix. Maybe 1gal in there - then spread across things evenly and mixed in to let sit for a week or so. Figured that was on the light enough side to offer value without risking overdoing things.