I've gotten like 3 Heaven's Eye IV's in the past 10 times I've converted an item to materia. Though to be perfectly fair, I melded all of my primal drops and a couple of belts.

Meanwhile, I'm 0/12 on my Avengers, so I'm just gonna buy them.

RNG gonna RNG. I'm fine with the melding chances, I just dislike how it's a part of the relic quest.