gotcha! what weapons were you using? the 1550 gg strike is basically just a Nightfall of that level but with scoring & the score based buffs, and Nightfall enemies are more accurate and aggressive than most trash adds in other content yeah. Nightfalls also have 'acute burns' which increase incoming damage of an element by 50% (!!) but increase your outgoing damage of that element by 25% too. Usually that won't warrant a subclass change, but it does make it more advantageous to run, say, an Arc hand cannon in an Arc burn NF when you'd normally use a void one. not a make-or-break bonus though.
on the topic of damage resistance, yeah, a 1550 nightfall enemy can get pretty damaging especially if they're taking advantage of the burn. of course one of the best strategies is using cover and movement to avoid taking the damage in the first place, but other than that, using appropriate damage resist mods in the chest armor mid 2 slots is hugely beneficial for 25% reduction (multiplicative). concussive dampener is generally very useful, but there's also nothing wrong with just rocking 2 Arc Resists to counteract an Arc burn - you'll have diminishing returns from stacking 2 of the same but not so much that the second is useless. also, fyi the Melee Resist and Sniper Resist mod names are a bit misleading - Melee works on any enemy within melee range, and Sniper works on any enemy beyond about 30 meters away. (in the screenshot, i have 5 resists on instead of the normal 2 because of a bunch of niche shit that probably won't matter when the Artifact changes tomorrow lol). for almost any pve activity at like "powerful cap" (1550 this season, usually increases by 10 each season) imo damage resist mods are easily a must-have in the chest slots
and then for Resilience - it's probably the most bizarre stat in terms of actual effects, and normally isn't worth investing into IMO. it gives you very very minor health increases but those are almost completely worthless in all PVE activities (but there are some useful breakpoints with Resilience that can save you from an extra shot in PVP). it also reduces stasis breakout damage ofc (almost never useful in PVE as well), as of tomorrow it gives you minor flinch reduction (but compared to other sources it's not much), and if you're on a Titan it helps your Barricade cooldown which is the big one. If you're on Sentinel with the Bastion aspect, your barricade becomes a source of constant overshields for you and allies, and that overshield gives you some damage resistance while it's active too. (it's pretty sick with Rally Barricade, which also has a shorter cooldown than Towering Barricade which is what most everyone uses.) for that reason only it makes sense to spec a bit into resilience on titan, but it's not the highest priority, and using the "utility kickstart" Stasis class item mod will help the cooldown a ton. in general, i basically never run without 100 recovery if i can help it - even for non-Warlocks, getting your HP back as fast as possible to get back in the fight is simply an enormous tempo increase for your play.
as far as 'serious' titan loadouts, it's hard to ever go wrong with Heart of Inmost Light if you have that. it just works with every subclass super well. but there are plenty of other fun neutral Titan exotics too, like Crest of Alpha Lupi or One-Eyed Mask. Thundercrash is the other heavy hitter for titan subclasses right now, and with that subclass, Cuirass of the Falling Star is almost mandatory for doubling your Thundercrash's damage. and if you don't have any of those, keep an eye on the daily lost sector rotations and maybe try to farm one out on the appropriate day. Legend lost sectors are eminently doable with practice and are the best (slash only) way to get a lot of the Exotic armor in the game right now. you should be able to see what the day's lost sector is on https://todayindestiny.com - the armor slot rotates daily as well between the 4 slots, so since i listed 3 chest exotics, probably want to wait for a chest day on that. there should be plenty of guides and speedruns ou there for each LS, so you can just copy what they do more or less lol
infodump complete...! hmu if you have more questions? on here or just on discord :) eden#8008