It just is what it is. I am at 88% Desynth success for i70 gear on gsm. On average I break about 50% of my desynths. As I type, I had 10 desynths to do. Broke 5 of them. Rng is Rng. Only thing you can bet on is if it is not 100%, don't expect success. I look at a 98% success rate the same as I look at a 50% success rate just from my experience alone dealing with desynth. Just gotta keep going and not dwell on it.