You should be able to complete making the Dated Leather Subligar (Black) with 30WVR just fine. It can complain all it wants, but it won't actually prevent you from making the item. I was able to do it with some difficultly with just 20WVR. I can't tell if you're not even trying because of that message, or maybe your gear just sucks.

There's also a 40 leve in Limsa >> Skull Valley and a 40 leve in Grid >> Nine Ivies.

I would just do the leather subligar one. Completing a leve reshuffles the leves available, so if the one you want doesn't show up, just complete some other leve and then come back to the counter.