The problem with penta-melded i70 is they have less, sometimes a lot less, of your job's primary attribute...which can hamper your ability. No crafted i70 are BiS for that reason. At most, they can be considered i75...but at the same time, compare Moogle weapons to Garuda to see the difference between i70 and i75. The Moogles have more damage and primary attributes, which is the big factor in the ilv increase (yes, they have more secondary attributes too, but that's also part of the ilv increase and not really as important as increasing STR or VIT).
Since you can throw any materia, no matter how useless, on a crafted/meldable item, you can't increase the ilv just because something is melded. What if I penta-melded something with resistance materia to bump its ilv...would you consider me better or worse for "wasting" the item?


You also have i55 gauntlets...that really need replacing...