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Why does my dps vary so much, ive followed the guide and got the unholy/frost spec, i got all t9 but 1 piece, enchants gems all that. but for some reason my dps varys from 2.5k to 4k. should it be that low? could it be my hit rating hurting me that much? its at 130
edit: my armory link The World of Warcraft Armory - Luthiann @ Executus - Profile
Also sometimes my skills such as ss, bs, it is on a 3-5 second cooldown and i have to wait, is that normal?
First, yeah that is normal... as stated above, fill with HoW, AMS, BS, etc...
Second, looking at your set-up, I'm wondering about your hit rating. DK cap is ~8% and yours is currently sitting at less than 4%. Fix that and then test your set-up again.