So... I hate to tell ya, but your gear looks pretty good. Bloodspawn, check. Maras, check. Plaguebreak-- okay, makes sense. Markyn, sure why not.

You could maybe swap plaguebreak for rallying and swap Markyn for sea serpent and be "more meta," but you're absolutely good to go with what you got.

Which makes me think perhaps the difference may be in your skills. May I ask what your bar setups are, which weapons are on what bar, and what your problem seems to be in your opinion? Is it sustain? Damage? Healing?

Okay good answer. I'm going to be a little lazy and respond without having clicked the link yet. I'll check it out later, but I have some tips for you just based on what you've said.

First off-- I can't imagine a DK wearing what you're wearing has a lot of crit. I would definitely change the precise sword to nirnhoned and put it in my main hand. This will help your damage a bit. Second off, having two shock enchants mean they share a cooldown and you basically only have one. Change them both, honestly. One fire and one poison. This will help your damage slightly (because now you have two working glyphs instead of one,) and will also increase your sustain by giving you more chances to apply poisoned or burning, which interacts with the DK combustion passive. You may miss the concussed and minor vulnerability-- keep one shock damage enchant if you really want (I wouldn't,) and pick which resource is harder to maintain for the other enchant. If your stam runs low pick poison... Fire for magicka.

I'm a big fan of D-Leap personally but consider using Corrosive if your penetration is low because you're using two swords. Or conversely change your sharpened sword (now in your off hand,) for a sharpened mace.

IF you switch to Corrosive as an ultimate then you can perhaps drop Noxious Breath from your setup. Which is important because I think these days it's nice to have a heal on your front bar. Coag should stay backbar since the missing health bonus is still effective regardless of weapon damage. Vigor goes to the front bar in my opinion, to benefit from your nirnhoned sword, and to make it easier to cast roughly every 4 seconds so you can stay on offense longer. If you want to keep using Noxious and D-Leap then that's fine. Consider giving up whirling blades then. A D-Leap + fully charged whip combo really should suffice as an execute. And Fossilize is hard enough to break free from that your whips should land and you won't need spinning that much.

Try to find a better way to get major brutality than from Igneous Weapons. The only answer available to you might be potions but give it some thought. Igneous isn't a particularly useful skill in PvP. Use Flare in its place for passive major protection.

Other than that... Just realize some players are very good and just can't always be killed 1v1. No shame in stalemating a duel these days. Happens all the time. And in battlegrounds it isn't always efficient to tunnel-vision one target and focus them down. Rather-- try to keep track of the larger battle and contribute bursts to groups of people that may already be struggling.

Long story short, experienced players are noticably stronger than average PvPer. Even in excatly the same setup in a 1v1 You can be outplayed like a kitten by skilled player to the point You wont scratch him and he will be able to control whole fight. Knowing You claas and enemy class, good weaving, predicting enemy moves, reacting quickly, adjusting to the flow of fight, using Your offense windows and setting them up properly are just some of the things You learn with time, that give You massive adventage over the enemy who havn't mastered those.

That answer confuses me @axi did you perhaps make a typo? You're saying they are weapon damage enchants, right?

In which case great. I would change that one Robust piece to be Infused also, and depending on OPs sustain issues make one stam or mag recovery. Nirnhoning the main hand weapon will basically make up for this and result in same damage but more sustain.

But only if needed! 3 infused weapon damage is probably best.

You said former increase physical harm enchants now give both mag and stam recovery. I think you didn't mean to say that. Moving on though because it isn't super important to understanding...

Yes, one tri-recovery glyph may be in order I agree.