I usually just go to wave 10 in legend then reset. That's all I know in terms of farming out BRAVE weapons.
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I've been farming it too. I set a link down there to a post I made > I go through the drop rates of rewards when farming. TLDR > attune Midnight, go through a regular 50 (if you have an hour), you will on average get 8-12 Brave weapon drops + trophies.. and potentially more chances to get a midnight (prob just under 50%).. although one time I had 6-8 drop in a row. Link to my forum post > [url]https://www.bungie.net/en/Forums/Post/263867290[/url]