Hello.
First off dont suggest what dps you should do compared to some vid's out there, Mudras are very latency depending and i saw on your Vid that their cast wasnt so fast as on JP/NA servers so thats a little bit every 20 sec over there. So as u suspected your DPS is droping some every time u cast them.


Also, remember u were playing your DRG much longer so u still need some practice on NIN, thats how it was with me at least, every time i went to 10-12 i was getting a lil better and better, so just play alot.

Also u should check out these topics, they long but good learn:

NIN Opener - Rotation
Ninja: Walk In Shadow