HQ Twinthread won't sell for much, they can actually be gotten relatively easily via spamming Peisteskin Treasure Maps.

Have you considered making a full Patrician set, then spamming quick synth to spiritbond those and convert to materia instead?

I feel like the real money to be made off crafting, outside of 2-star, is the materia market. But even that depends on how well your market is doing.