Wow yours look awfully sooted, mine didn't look anything like that. Just normal dirty brown. I also unshroud the electrode on all my plugs, makes a huge difference at low rpms. You should try it.
Between the new plugs and smoothing the crazy sharp edges a bit in the throttle body the car really responds smoothly to any throttle inputs at any speed. I can post some pics up if you are interested in trying it. What I did was buy a used TB and then used info from a video on youtube. Car works so much nicer at part throttle now.
I didn't go as far but just used this as a guide. WORKS!