PS Warrior

Builds

You have the trait Stick and Move - make sure your endurance isn't always full. Burst skills restore endurance, remember.
Blood Reckoning gives might, adrenaline, and recharges primal burst cool downs. Make sure you are using it when in berserker mode for additional DPS
Swaping out of Greatsword is a huge DPS loss for the raid, and should only be done in an emergency (E.G. Breaking the sacrifice at Matthius)
Consider taking 2 greatswords into fights where breaks are low priority (Sabetha). Swapping weapons is a great way to cancel GS 5 and 3
Try not to use GS 5 unless you are inside the Boss's hitbox.
The GS Auto Attack has terrible DPS and should be used as little as possible. Ideally, you want to be best friends with the Mesmer and get as much Alacrity as possible as this will put your DPS into insane levels

Swap out Signet of Fury for Stomp to knock back seekers, and help with break bars. In movement/kiting phase, time your Heabutt carefully so you have it ready for break bars
Depending on your DPS, you can generally use Headbutt to break VG during the split phase, and have it be ready for the first break in phases 3 and 5
Stomp is far better for seeker control than breaking
Consider taking Wild Blow over Stomp if the raid's seeker control is good but you are struggling for breaks.
You make an excellent back-up for the circle group due to GS3 and GS5 giving you excellent mobility. Just remember to turn off Auto-Targeting is GS5ing into a seeker is bad

Depending on the speed at which Gorseval's break bar is being removed, consider taking Wild Blow instead of Signet of Fury to help with breakbars.
Time your Headbutt usage so that you have it ready for break bars. Often you will not have enough time to use it at the very start of the fight and for the first break bar, depending on DPS
It is generally best to open the fight GS 4 > Heatbutt > Beserk > Arc Divider > GS 3 > GS 2. If timed correctly GS 3 should dodge the slam and allow you to get a full hit of GS 2 in before the Rampage
Throw Bolas can be used to assist with holding a spirit. At the start of the spirit phase use Throw Bolas on the 4th spirit and then join the zerg.
GS4 can be safely used to clear off low health orbs
Mace/Mace may be better than Mace/Shield in this fight, as during the final phase you can use Mace 5 as a ranged break to avoid damage during the Rampage

Be careful if you use Rush (Greatsword 5), as Sabetha teleports off the platform. Doing this when she teleports will cause you to run off the platform to your death
If the zerg is stacking correctly, you can take 2 steps to your left when the Flame Wall starts and use GS2. Even in the final phase it will finish with enough time remaining for you to move away for the last part of the wall
As breaks are not a high priority in this fight, consider taking Battle Standard. It can save the raid from a wipe and save people from the Flame Wall
It is generally not a good idea to use GS2 during the final phase of the fight as you will need to stay as mobile as possible
If you are controlling Timed Bombs (and you probably should be). Use GS3 to quickly get away from the rest of the zerg. You can begin walking back towards the zerg before the Timed Bomb Explodes, and use GS4 and Arc Divider on the way back in, and then GS5 as you are moving back through Sabetha
Auto Targeting is almost recommend here, as it will save you from accidentally GS5ing off the platform

Don't try to keep up Stick and Move. Save your dodges in this fight, there are plenty of mechanics that need you to have dodges ready
Shake it off can be used as an extra stun breaker if required
Headbutt is also a stun breaker. Use it if you find yourself being feared into certain death
Defiant Stance can be taken over Blood Reckoning. It will allow you to heal to full when dropping the poison and heal while resing people who go down in a bad spot
You will need GS3 + one dodge to avoid all of Slothasor's shake attack

Trying to Melee Narella can be difficult. If you want to Melee Narella, take Balanced Stance over Signet of Fury
Longbow can be used to safely DPS Narella at range as well as apply easy burning stacks
In between bandits, charge your adrenaline on ads so you can enter Beserk as soon as one of the Trio appears

Defiant Stance will almost always be required here over Blood Reckoning
Auto Targeting can never be used. Being able to GS5 towards a well to clear poison is too good
You will almost always need to take Wild Blow over Signet of Fury due to breaks
Even when Matthius has his shield up, you can still attack him to generate Might for the raid (zero damage crits are still crits)
GS3 and GS5 don't count as moving during the Rain phase
Entering Beserk applies Taunt to enemies, and can be used for additional break bar damage

Balanced Stance will be required unless you're group as another source of Stability (Both Paths)
Entering Beserk can be used to interupt and pull enemies, as well as break Clerics (Both Paths)
Consider taking Signet of Fury, Signet of Might and Balanced Stance if you are in the top group. Depending on group DPS this will give you more burst and may be enough to clear all mobs before the sustained DPS of the banners is required