Tarnation and CTP should be guaranteed deepsight drops after the fix, I can´t imagine this quest step was ever intended to take more than a week.
Nobody even wants to craft these weapons, they will be instantly dismantled when the quest step is done.
Mindlessly grinding the same activity over and over has become the most boring waste of time this game has to offer for me.
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Remember they are listening even though they instantly patched the Deepsight their 3 chests that we were farming but this will take them over a month to even look at.