You act like cul desynth is unique in this way. If you have a 50% chance on a 2 star item, every desynth is going to get +.3 to +.45 skill ups, Also when getting skill ups I only use items from 50-70% success because of the amount of skill is better. I know I can get to lvl 67 desynth using hover worms in coer. From just about every fish I catch so yeah that's still way easier then any other craft. One Google search and the first 4 results tell you use takati from urth to go from 70-78. Also their is an old thread on this forum from launch of 2.3 that was all about discovering WC and it showed every known way, a simple forum search would have answered the ops question, instead he argues. He could go lvl desynth and ask for help with it, instead he argues. I found my own way to lvl GSM desynth that wasn't in any guides and I have spent way less Gil for lots for more lvls, and judging by mb prices im not the only one who does it this way. If you want to take it slow that's your choice.