The patch notes indicate that a better tier of crafting gear is on the way, so I wouldn't meld any more than you have to. My current gear sets are the best crafted items you can currently have at HQ for each slot but nothing is melded except for the belt and the rings. That's still enough to meet the minimum stat requirements for anything that existed prior to the patch, and as a bonus I can convert the current gear to materia without feeling like I wasted things now.