When I am crafting for success I too always have Preserve and Fulfillment set. I also generally use Brands of Lightning and Wind. Sometimes I have to Wait. Then there is crafting gear and support/manuals where recommended. After that, sure failure can happen, but more often than not, it doesn't. Don't let a little randomness get you frustrated.

Just because the little orb starts off with a friendly white glow doesn't mean you are geared correctly or in for an easy synthesis. If a synthesis is consistently going bad, then chances are you are missing something. Wrong gear or lacking support or too low level. An occasional failure on an otherwise easy synth is just the RNG and is nothing to get worked up over.