Just imagine how much better you'd do if you DID use Unholy Presence.
Just because you are beating someone in dps doesn't mean that their spec or setup is worse than yours-- it just means you're a better player.
With your current setup, even though you are beating people in dps, you are not playing your character to your full potential.
I haven't lost in dps to another DK in months as an Unholy Presence DW Frost DK, and I typically stomp Frost Presence DKs. It's too subjective to mean anything.
You may not be good at keeping up with the faster pace of UH pres, which may be why you're seeing a dps drop. It also has a different priority than Frost pres dps, so you should make sure you're using the correct priority rotation.
Let's keep it on topic. No e-peen comparing :P
Reguardless if he wants to compare his dps to LFR dk's or not, you thinking you are actually good by coming in here telling to basically get@mylogsbro is pretty laughable. There is nothing even redeeming about you holding logs on 3/8 heroic bosses. So once you hold a log for months on a top tier boss then you can come here acting like your logs are good, otherwise it would be wise for you to take a backseat on your elitism because you aren't even a top tier dk.
If you can't do more dps in unholy presence then you're doing something wrong.
Unholy is better on single targets, this is a fact, it's not up for debate.
Some logs would be enlightening.