From my experience with this industry it seems the best at utilizing low q materials in the process which if that principle is taken to other industries gives hermits and newbs a decent way to trade onwards. When i was doing spiraling there were a few things that made it good and bad.
Accidentally clicking the skills made me worry alot especially if it was a public spiral character. if i was to change this i would make it so skills increase the chance to get metal back and have forges make bloom 100% and have 2 skills, 1 makes wrought for steel and the other for cast iron then add in a chance to stay same q or 20% it is atm or turns to slag. this way we aint dropping tons of slag immediately but have to gamble when making metal and maybe make wrought have a higher chance for bar then cast iron recipe, because in my opinion i love the gamble of will it proc or not vs the fuck i got 80% slags in my forges.
Now that may seem a bit op in some regards, but its merely swapping it around to allow for another situation where we can add in other recipes such as tin/copper/bronze spiraling depending on which is most common in your area and we can add in that meteorite has a very low slag chance meaning if you get a few bars then your chance to spiral a few times from it is much higher and more sort after.