I've noticed this, too, but I developed a superstition over it. The longer I craft without taking a break, the more it seems I also hit that 1 in 10 chance of failing with Basic Touch/Steady Hand. I eventually thought, "Maybe the wear on my gear is affecting the success rate". I don't craft in the nude; I believe in making HQ items ALL the time, if only for the 300% exp bonus.

Like I said, it's only superstition to me, and I have no proof to back it up, nor can I support that repairing my gear helped in any way. RNG tends to hate on people with green hair (me being superstitious again).