I've been updating my progress through Moria in order to get a trait point and to get to Mirkwood. With the narrower passages in Moria being more of a challenge for sneaking, your Burglar will actually get more skilled in judging agro distance and walking in Sneak very close to the mobs. It does make it a bit harder to get the right position without using Diversion, but with only a 20s cooldown, you can use it often and aggressively.

With the Burglar overhaul, Burgs do more damage with their base attack damage and less with bleeds. This definitely bolsters the Red line but hinders the Blue line (which I still play in groups). A Red specced Burglar can often one-shot foes in Moria with proper set up, and still get 50% - 65% damage down on the first shot under less ideal procs. Tactical use of Knives Out can waste trash mobs and put some good hurt on bigger foes. Blue Burglars kill slower and die slower, but are very survivable in Moria to the point where you really don't worry much about getting hurt.

If you're running solo, then between Provoke, Hide in Plain Site, Touch and Go, Ready and Able, and either Blind Bet/Hedge Your Bet in Blue or Knives Out in Red, you have a lot of survivability options.

If you're going into an area cluttered with mobs, go Blue trait and use All In often. If clearing foes one at a time, go Red and get the backstabs in. You'll find Moria is not hard at all.