I originally wrote a paragraph on why the -blam!-ing resonate stem farming is a pain but bungie just make it so duplicates are less likely from bray tech schematics PLEASE i'm so sick of getting the frigid jackal
EDIT/UPDATE 5/1/2018 -
After roughly 15 hours of farming and opening over 400 resonate stems worth of sleeper nodes and receiving 70 mad monk shaders, 50 arctic dreamscape shaders 2 18 kelvins, 3 braytech winter wolf's, 5 fridgid jackals i finally got a Niflhiem frost.
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At this point the missing weapons like the rocket and sniper need to be put into ana brays loot pool where you can use mars tokens to get weapons.