make it drp it now or then at every kill inside mission. make the same thing with tomb flake and tomb/contest of elders.
otherwise this is just absolutely garbage economic.
Edit: Bungie buffed the drops, 4 per normal run, 9 in expert (so I heard, I didn't play the mission after that).
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It's fine as is. I've done a total of 5 runs and have unlocked all the new tonics but 1.