Decware and SET Low Power Tube Amps with Hi Efficency Speakers

I’m running a pair of Zu Dirty Weekend Mk. II ‘s with the Clarity Cap upgrade and I alternate between my Dennis Had Inspire PSE Fire Bottle amp with built in Blue Alps volume attenuator, and a David Belles Aria integrated amp. 

The Inspire is rated anywhere from 16 WPC to 23 WPC depending on which output tubes I use and the Belles Aria is rated at 70 WPC.
 
I think I agree with earlier noted observations that the Zu’s definitely perform well with good solid state as well as good low power tubes. Right now I can’t really say which I prefer as they both sound great but different.

I drive my Tekton Lores with a Decware Zen. The combination is pure magic as far as I'm concerned. Imaging is amazing.

Let me know if you have any specific questions.

I am using Decware HDT speakers and the Torii mk3. The amp replaces Wright Sound Mono8's. I would never consider anything less than 8 watts with my speakers that are 95db efficient unless you listen at moderate levels and aren't looking for dynamics, realistic levels. There is a lot I miss with this 300b but it's all a trade off. Steve's low power SET would need something in the 97db range minimum to my taste and I listen fairly near field and love my jazz. 

frustee

I have never used the headphone jack.  Just speakers

I’m new to tube amps having used only SS in a vintage 70s Pioneer spec system I’ve been ruining for a long time.  I held out upgrading to anything new or better telling myself at this point in the game my ears are too shot to benefit upgrading to new and better but, finally caved and purchased a pair of Klipsch CW IVs and a cheap low power Chinese tube amp to use as a placeholder while I learned more about tube amps. 

I understand lots of people pair the CWs with 2-3 watt amps with what they consider stellar results. In the guitar amp world there is usually a sweet spot you need to be running the tubes at even if running a clean sound (no desired distortion) so often times even for live performance players will use attenuators between the amp and speaker to drive the tubes but keep the volume down. 
Does this analogy hold with stereo amps so there is an optimum volume setting that is needed to drive the speakers for a better sound so a higher powered tube amp becomes detrimental to sound because the volume needs to be incrementally higher to achieve the sweet spot? Or, is it the opposite with stereo amps which by design, more watts just equals more volume and too much power is like using a Ferrari as a commuter car that you can never get above 35mph.  
Any links to articles or other would be greatly appreciated but I’m in a bit of information overload having been reading and watching YouTube videos on low watt tube amps so anyone with CWs and their experience would help. As an FYI, I’m primarily a vinyl classic rock loud volume listener.  Thanks