Closing this off in the event someone else reads it.
The Harbeth P3ESR were a great choice. They make me smile. I find the vocal/midrange exceedling pleasant. Bass at low-levels is warm - it fills the room the way I wanted at day time listening levels. I haven't had a lot of later night cranking it up - but the few moments they hold their own. If it were my "listening room" I would be chasing a sub. I find the trebble detailed without being annoying - my pro monitors were annoying me - to harsh.
I am driving them with a Grant Fidelity RITA-880 at 45W per channel. In a dedicated setup they could proabably handle more input for a bigger room or if you want to shake the walls. But noting I am comparing them against Dynaudio Evoke 50s driven by a PL EVO 400; not a fair comparison.
Placement in terms of close to the back of the shelf has little impact to me - closed cabinent was a good choice for this application. Spacing and listenting position do matter - they shine when I can sit in the proper chair and listen. its nice.
I mean this 110% positively - they are great speakers for background music. For the size and price surprisingly adequate for more critical listenting. They are really nice looking - I never liked the looks in pictures but IRL I now get it.
If/when I can try the Watkins these may find their way into my formal living room as I think my audio impaired wife might enjoy the warmth.