I had a friend ask me what to craft around your range last night in terms of GSM. I went over the crafting log, and while I don't know the results in terms of how much vrs how difficult, I found that the Adamantose Shell Braclets appear to be the way to go. You can mine those from lvl 40 nodes, the synth only requires 1 of the shells each, and the recipie was lvl 49/50. Might be worth looking into if you can mine.