Hi,
I have noticed an even lower rate as usual of getting rarer materials from salvaging an item with a Black Lion Salvage Kit( 50% ) or a Master/Mystic Forge Salvage Kit (25%).
This days salvaging yellows/oranges is dropping less ectos/salvage with a Black Lion than ever, this is bad, but when we come back from fractals, bags full of crap, once and again, getting a rarer material from a master/mystic is by a large amount of trys closer to 10% than the supossed 25%, and it may not be so wastefull, but surely it is wrong to try again and again and just get the same 2 mithrils ( wooden or cloths are just not worth salvaging anymore ) and get 1 orichalcum ( if any) from all the Fractal crap.
Maybe fractal items have less chance to salvage ? It needs a closer view.