Can recommend some non-fatigue SMALL bookshelf for near-field listening?

P3ESR XD is reported to sound brighter than the original P3ESR.

I would vote P3ESR for your requirement. Anything warmer than this the treble would be rolled off and sound pretty dead.

Sonus Faber older models such as Concertino or Concerto also sound warm. However, the main difference between Sonus Faber warm and Harbeth warm is in clarity and detail. Although the Harbeth sounds warm, the clarity and detail are quite good. It's more transparent than the Sonus Faber. With the SF, you lose detail which in turn affects clarity. The result is you appear to be listening to the speakers with a thick blanket covering it.

Usher 520's.

For me: Focal Sopra No.1. I'm still amazed listening to them... No fatigue at all and render almost all type of music flawlessly!

Spendor, several models may fit your needs. They are definitely non fatiguing 

There are a couple of pairs of the Platinum Audio Solo for sale right now here on Agon.  This would likely be a leap of faith as most are unaware.  I have the floor standing Quattro of this series and loved them for about 15 years until moving to my Wilsons.  The Platinums are power hungry but I suspect your 150wpc would suffice in a reasonable space.  Their bass from the 4.5 in driver is unbelievably accurate and deep.  Take a look!

https://www.stereophile.com/standloudspeakers/1195platinum/index.html