odd thing, Wow's stat bar concernign speed is saying iam stalking faster than i run [with nightstalker and the assasination speed buff talents invested in]
How is that shocking to you? 15% from Quickening, and 10% from Nightstalker.
You should be at 115% when you're out of stealth and something like 126% (or 125%, I forget whether it's additive or multiplicative in WoW) in stealth.
The REAL question is "why do you have both Quickening and Nightstalker in the same build?"