Your current build doesn't appear to have enough power to run your multicannon, even with several other non-essential systems turned off. You're going to need to engineer your PP, either armored or overcharged, to run everything (don't worry, this is normal, the Vultures main weakness is its low power output). I would also suggest then looking at engineering your thrusters for dirty drags, but again, watch your power. Felicity can do grade 1 on your PP and up to grade 3 on your thrusters. If you go up to grade 3 DD then you'll need either overcharged grade 1, or armored + monstered to run everything currently.
EDIT; Damn Ninjas!
EDIT; Damn Ninjas!