I dont know what OCE servers are like. NA has DRK comps all over the place. People just understand them and can counter them. It isn't balanced, but FL never is. The dev team straight up says they have kits balanced for small scale PVP. From what I understand based on the comments here, the problem on OCE is the lack of people PVPing. A single 4-man group being able to command an entire game that well basically means they are the only people ding it and the other 68 people are just praying to be on their team. And the only way to fix that is to get more people in FL or to get the people currently playing FL to play better. Which means you are going to have to do the thing people don't want to do in FL, shotcall. There's nothing stopping you from marking and commanding your alliance. Seems like no one but those few are actually doing that.
As for DNC, it just seems like you have to play better. Understand that you are a DNC. That means you have no damage reduction ad your damage on melees and tanks is going to suck. Don't even bother with those 15y moves unless you are poking at a straggler. And even then, you only ever want to do it to proc Saber Dance. in FL, you have only 2 objectives. Buff your dance partner and to LB big groups of people to help your alliance. You should NOT be the first person to jump in. It's up to your tanks or the enemy tanks to do that. And once that is done you make your move. If you let your tanks draw fire or the DRK CC the group, you can dash in and LB. If their DRK jumps on your group and you dash passed them to LB their group, that means they are focusing you and not blowing up your pulled alliance. You'll die, but your alliance will be alive long enough to get out of the DRK pull. After that, it's up to their own skill to not take your enemy's AoE damage when they aren't even CC'd.
If you are playing DNC by dashing into your 15y range to do damage, you are basically a free kill in FL. Stop doing that. DRK pull isn't what is at fault there.