Raven Blackhawk LE... am I going to be disappointed?

That’s one interpretation. Another is, it is typical of solid state performance to exaggerate leading edges relative to the full body of the tone. They almost always get this balance wrong, which does have the effect on some guys of thinking this is tight, greater definition, more detail, etc. When in reality it is just added glare.

Instead of trying to fit everything into a preconceived narrative, how about reading the actual listener comments?

The openess, bloom and freq response is amazing.

These comments are totally at odds with "lack of current to fully drive" anything. You simply do not get openess and bloom with a lack of anything. What you get instead is compression and congestion. The idea the amp is running out of current is not based on anything in evidence here. It is pure preconceived narrative.

Taps are purely for convenience and to give you the option to find one that might sound a little better. Which tap you run means nothing as far as the amp itself is concerned. There is a technical difference of course but all that matters is if one does sound better, use that one. Regardless of what the speakers are rated or the amp says.

Taps are for convenience? I think an amp designer will disagree with this. You keep forgetting about impedance and matching an amp with speakers to achieve optimal performance.

You're saying it would be easier to cut open the amp and unwind windings? Remember to put brain in gear before releasing clutch on mouth. Sage advice from long ago.

Yeah, so these 20 watts are plenty.   So weird.  Who would have thought.  And yes, this amp is pretty cool.  Dont think its going anywhere except to Raven for some service, updates, upgrades.  Ravens customer service is awesome, and their prices are reasonable too!  
Anyways, more to come later