Just throwing my hat in the ring on this one, but I've changed cooling solution since this; was H110i AIO before, but now a 3 x 360mm rad custom loop, so I need to test again at some point.
My 3900x is about 6 weeks old now and does 4.3GHz @ 1.181v (1.275v set in BIOS, auto LLC brings it down to 1.181v during P95 Small FFT) which was the FIT voltage with the H110i; not really had time to play since I got the custom loop set up, so I suspect the FIT voltage will go up slightly due to lower temps.
Also does 1800 FCLK with vSOC at 1v, not tried higher yet. This again has auto LLC, 1.025v set in BIOS, droops to 1.006v "idle" and 1.0v during heavy RAM loads like TM5.
Currently running stock with CB20 score 7302 - I use the PC for work, so not much chance to play with it recently.
Will update as I do