Yeah - keep hoping I might get lucky and obtain it that way, but no joy so far.
Have even tried running Yuweyawata Field Station with a Trust team a fair number of times. It dropped the fending bottoms a few times but never the top!
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I did unsync runs, put a PF up, lock it to iLvl 690 or higher(absolute bare minimum for level 100), lock my Alliance to prevent any other DRG, RPR or LNC from joining that alliance specifically, last step isn't necessary, but I was so far deep that I wasn't willing to risk it, if it dropped, it had to be mine.
Run with 6-ish people, more is better, and it's doable with as few as 3, but unless you are desperate it starts taking too long, and if you are able to find a group willing to play ball, only run up to Hobbes and then quit once he is dead.
I really wish the level cap dungeons dungeons had the same loot system as lvling dungeon and that they made it possible to exchange the tokens you get from alliance raids for gear pieces. While I get that they do that to encourage people to do those content repeatedly, the RNG can be so frustrating I often just abandon glam ideas that require pieces from alliance or level cap dungeon I don't own.