I'll look into the xp gain. But tell me are you using a secondary component or just bolts of fabrics?
As I leveled all the way to 40+ I'll try and give my notes here.
Being that there's only four things we can make the list is pretty simple. It's how we stumbled onto Slings being the most efficient use of materials to begin with. And I experimented with it quite greatly during my journey. Also this was BEFORE the DC crunching for whatever relevance that has, but the breakdown is pretty simple:
Hoods with
one bolt is x1 the EXP rate. So if you were to do a DC 10 hood at level 1 or 0, you'd just get like 11 exp or whatever. Use a secondary component (the exotic threads) and you'd get x2 the EXP. So 22 or some such.
Clothing and Cloaks both need
two bolts of fabric so that's always going to be x2 the rate. Then we add on exotic thread, that's x3. (And with the change that cloaks and clothes no longer need two thread materials, we can't reach x4 anymore.)
Slings require
two (which still is 4 of a material in total) cords and
one leather patch. No additional pieces can be added so this is always x3.
So when it all comes together. We go with slings, not because of leather or whatnot - But because making two cords requires only
four of, say Flax. Whereas no matter what, hood clothes and cloaks will
always take more, it always ends up being
for less. Stacking on threads will make it more efficient but this really only helps out minorly with silk and such - Anything that can't be made into cords essentially.
Given that other crafts for the most part exchange all their materials with experience at a 1:1 ration (Katana takes 4 ingots, gives you x4 the exp rate). It would make sense that bolts of cloth do the same right? (4 flax goes into one bolt of cloth, that one bolt of cloth should be x4 at that rate). Or if that's too much then, some kind of boost at least right?
The DC Crunch had the side affect of making leveling even
longer because a lot of the clothes and slings are now easier to make, so you can't reach as high a level now really. Case in point, all the tailors I knew leveling up, are still the only ones I know of. Most people I've tried to teach the system, give up part way through and pursue other crafts.