Any Fatboy Unipivot Users?

OK, most are opting for the gimballed arm because it is better, a lot better.
You can go to Lyra's web site and see that recommendation yourself. Perhaps because you seem to have been stuck on unipivot arms you might not understand the improvement you will get with a tonearm that does have adequate bearings and stability. All those tonearms you mention are seriously compromised. The Unipivot is  just a cheep easy way to make a tonearm unless you go at it like Basis and Graham. You certainly do not have to listen to me but perhaps I might be able to keep others from making the same mistakes you have. If you were happy with your arms why do you keep changing? I have had the same arm for 40 years and am just moving up now to an arm with wonderful bearings, neutral balance and vertical bearings at record level. 

Smart move dhcod. Unipivot arms are inherently unstable. Look at the effort Basis and Graham put into their arms just to stabilize them. The Basis isn't even a unipivot any more. It is a bipivot. With very compliant cartridges there is some rational to it but with the stiffer cartridges we use today, forget it. If bearing "chatter" is a problem what is right about an arm freely rotation on it longitudinal axis? Some manufacturers like Lyra specifically recommend against unipivot arms. 
If you have a unipivot and move to the gimbaled arm you will notice the bass tighten right up and you will no longer have to mess with the azimuth all the time.