@dwette You just reminded me that I had a Clearaudio Innovation before I got the Jubilee - I forgot to put it on the list. I had the Universal arm with the Innovation.
The Unity is a completely different design. Effectively, it has all the low friction benefits of a unipivot coupled without the potential drawbacks of yawing and bearing chatter. The armtube is a lot stiffer than the Universal's and the headshell - which is also more rigid is bonded to the armtube - but they have maintained azymuth adjustment by moving it to the other end of the arm - but done so in a way that this doesn't compromise rigidity. There are lots of other clever design details like the lockable micrometer VTA adjustment.
Sonically, its a very revealing, very low noise and tonally neutral arm - just lets the music flow in a very natural way.
I've heard the Blackbird a few times but not enough to be able to make any kind of comparison. The finishing on the Blackbird is a little "industrial", but that is reflected in its price.
You probably know the Unity it's a ten inch arm. I think there are plans for a twelve inch version, but I don't think its available yet.
There are also some new power supplies coming which were unveiled at Vienna. I don't know what PSU you have with the Master, but given the massive improvement the Professional PSU made over the older wall wart, I would probably look in that direction first.
There's a new Clearaudio website under development - it's still mostly in German at the moment. But it has much better pictures of the equipment than the previous side did.