Sam all most of your black wet plugs are fed off of the passenger side ( upper plenum) of the Carb so I think some of your issue lies there.
It's I bit hard to tell, but it also looks like your plugs are one step too hot judging from what I see of the good looking plugs even though they do not just have only full throttle time on them.
I would be curious as to what a compression test shows up in relation to the bad looking plugs.
Sam, in terms of doing any more porting work on your heads I would not bother, since out of the box they flow more then what your stock HO Intake does, so your Intake is the area cork.
Already this type of area mismatch is giving you a narrower power band then what you could have, and increasing air flow by porting the heads will only make that issue deeper.
Number 1 is what you have taking place, when its number 2 in my photo that you want in a perfect world.
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