Since I noticed that your LTW is only level 54 atm: I would advise you not to seriously meld anything until you reach max-level. Or at least not to spend to much gil on any melds, its not worth it for gear that you'll replace within two levels again.
Serious melding is only worth it on "endgame"-gear - and then its basically the usual rule of melding the most expensive stuff first.

(Also, if you dont mind me giving you a little advice: Crossclassskills are equally, if not more important to sucessfully craft. You dont only need certain stats, but also certain skills - crp to 50 for Byregots Blessing, weaver to 15 (or better 50), cul to 38, alchemist to 15 (or better 50). Currently for HW endgame-crafts you also want armorer to 50 and gsm to 54 - I dont know if this will change with SB or not, but it wont hurt to level those classes to get some key skills!)