[2018] PSA: Sulphite costs DOUBLE from depth 57 to 58 (monster level 68/69), but Azurite drops only moderately increase

The Delve model is the same as before, with the first 33 or so levels worth of depths chopped off as Niko starts later. We also increased Sulphite Capacity by a lot to compensate. The doubling you mention is something that was there before (once it hits map-level monsters, the curve changes).

I'm going to go through the feedback carefully during the day to try to find problems. Maybe there's more we can still improve here. If so, the problems would likely stem from you finding Sulphite less frequently than before but in bigger chunks (so when you're delving is less predictable and diverges from the model for players who delve more or less than average).