This is more of a suggestion rather than help because I have been struggling to obtain my preferred stat roles. But I have looked into the pros and cons and I believe that making fragments master workable would make a great addition and work similarly to masterworking armor while only adding +1 to any existing stat boosts, with the addition of taking away 2 of any stat of the master worked fragment that subtracts from any affected stat. - JBR_Scorp
P.S if anyone knows how to relay this Idea to bungie feel free to do so, I just think this would make a great addition to the game of Destiny2