I received my replacement top nut from Angelfiremods that has the chamfered edges, it also came with some parts which go inside the juice flow control section at the base of the deck.
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I'm about to pop to the post depot to pick up the S adapter kit I got from Cloud9 so looks like I'll be stripping mine apart and putting in quite a few new pieces. Will be interesting to see how much of a difference they make.
Edit: So I've got the S kit adapter and stripping it down but I've encountered a problem. I've taken the 510 screw out and the little nut in the insulator that it connects to (The bottom 2 items on the left in the picture above), on the other side won't come out. Just watched a video of someone taking a Moander clone apart and that part just popped out for them. so I can't get to the flat head nut that sits underneath it to take those parts out. Anyone have any ideas?