Just just rebuilt my Engine and still breaking it in so I have not been able to test my clutch and FW setup but I selected the J's Racing 3.9kg FW with a Spoon Clutch Disk and pressureplate.
The Spoon pressureplate is noticeably heavier (not meaning in weight but grab) Spoon claims 30% more but it's really hard to gage at this point.
The J's FW is fine but a little light for my taste. It does idel very smoothe and no surges or pulsing. I think is would be perfect for me if it were say arounf 4.1kg
In response to the weight distribution comment. This is exactly true. if you notice the design of the TODA, JUN and the J'S FW you see that twars the edge there are large holes most if not all of these FW are constructed of Leightweight Cromoly. Weight distribution is as important if not more important than the over all weight itself.
One other Mod I was able to test was the slave hose from SPoon. This made for a more exact pedal response for the clutch and seemingly better control when feathering the clutch. I do think this will be a modification that I include to my setup