If this is real (I have not converted any Ilvl 90 items for myself yet), then I have to agree that it's pretty bull and inconsistent. Ilvl 1-29 gives I material, 30-45 II, 45-70 for III. All have a small chance of being converted into a grade higher than it's bracket, so where does IV fall now? It seem incredibly weird that there's such a huge jump in bracket difference from III to IV if 70+ doesn't have a garunteed chance for materia, esp considering the SBing rate and how it's incredibly limited to that we have to burden groups in DF to do so.

I also never understood the reasoning of why most dungeon greens are unconvertable (which is also inconsistent since aetherial weapons which are in the same category as dungeon drops, as well as the coilisuem and Buccaneer's seires from DD)