I think in the end the Yaesu FTDX line has done a wonderful job of dealing with noise. I believe not only do they have a superior NB, WNB and NR but they also have a well tuned audio out of the box. It makes for a very pleasant listening environment.
However, I am enjoying all the features of the flex, while tolerating the challenges around noise mitigation. I also love the community. All of you are very welcoming and I have personally learned a ton in the past few weeks.
In the end I love my flex and can live with the higher noise levels than what I had. Unfortunately I already promised my FTDX3k to my father and will be down to just the flex. I dont think its a consolation and somewhat even enjoy the ride.
I say keep it available and let it be what it is for you.
Is there anyway you could record your noise profiles (like Ken did with his tutorials) and post them to this site?
It would also be most helpful if you could record and post the comparison with your Yaesu...
Perhaps one of the Flex noise mitigation geniuses might be able to diagnose what is so special about your noise that WNB and NR do not work and fix them in a future software release.
For what it is worth I have found two things with the SmartSDR noise improvement controls:
First they seem to take a bit of fiddling to get right.
Second you seem to need to have another radio to do A/B comparisons to truly understand what the radio is doing.
I've had the change to do A/B with an IC-7800 and with a Hilberling PT-8800A, and consistently the Flex-6700 could hear DX that the other didn't. The other two produced "prettier sounding output" in some configurations, but the Flex could pull out more.
There is a downside to a radio that hears more, is that "more" includes more noise.
Oh - I also had to set aside my usual style of setting up a radio with the Flex as the usual sort of settings magnified the noise floor needlessly.
Of course YYMV, but certainly you won't learn how to make the radio work for you if it is boxed up and put away either!
As for me WNB works great, on 40M at night the band is closed for me unless WNB is on. I still can't believe how well it works. But for others as I read, WNB has no effect on the noise they have and they feel that WNB is not done right. But It just means their noise is not the type WNB is made for. I think they will continue to tweak the NR and NB going ahead. I don't think they are all done yet, and they hear us....