Your speakers at 91dB are not awful but are below my (admittedly totally arbitrary) cutoff of 92dB that anyone should consider before buying any speaker. But plenty of others are in the same boat and getting great sound so that is not the real issue here.
I am with you on holographic imaging, it is probably the most compelling thing you can have going for you in a great hi-end system. Only problem, nothing out of the box new has awesome holographic imaging. Instead, the sound you get early on is always out of focus. How much and how bad is relative and all over the map.
But the good news is if the component is any good- which the Blackhawk certainly is - this will improve rapidly. I doubt you will be waiting any 100 hours for it to impress.
Now in terms of what can make it even a whole lot better, tube amps because of the way they work are particularly sensitive to vibration. The electrons physically travel across a vacuum between metal plates. You can see the darn things in action! The tubes stick up out of the amp. It is like putting something sensitive on top of a pole. Any vibration at the base is exaggerated by being out on the end of the pole. And these metal plates, they are sending and receiving our signal. Obviously even tiny micro vibrations are going to mess that up, big time.
They do. That is why one of the better things you can do is put the amp on Townshend Podiums. I did with mine and the improvement was shocking. Greater image focus, speakers disappear even more, blacker backgrounds, better macro-dynamics, and a lot better micro-dynamics. Subtle details just pop out now, individual threads of instruments are now easy to hear even within complex loud music.
But mostly I think your Blackhawk just needs more time. Keep playing and see how you feel another 10-20-40 hours from now.