Proud Harbeth p3esr owner - need help tweaking/troubleshooting


Due to the pandemic I catch myself spending more time in my outdoor office space - small 14.5x7.5 feet room with glass windows on two adjacent walls - where the speaker are. It's got wood floors and a 7.5 feet ceiling. The other half has a large desk and a bookshelf. Since it's my private space I have decided to build 'my dream' audio system - different from my main listening room/home theater. I listen to all genres of music from 80's and 90's pop, Folk, Jazz, Electronic, Classic Rock and Latin. No hard Rock or headbangers music.

In my mid-40's and enjoying the audio hobby for decades now, I like my music warm, with non-fatigue listening for hours, where frequency tones are balanced, yet detailed without the grain and glare of vocal peaks or highs, yet presenting instrument separation. I want to enjoy the music. I took the leap, and purchased a pair of Harbeth p3esr. Also, purchased Croft Phone Integrated amplifier to pair with the speakers. Had a Metrum Onyx DAC at home already hooked to my Roon core. Using Morrow Audio MA1 RCA interconnects that were laying around, with Belden speaker wires also on hand. Speakers are on heavy 26 inch stands.

I have around 60 hours on the Croft integrated and Harbeth p3esr so far, but have not found the audio nirvana moment yet. I find the music at times (on certain songs) harsh. It's usually when multiple instruments are played together with sharp pitched vocals. Don't get me wrong - Emma Guzman - Woman the instrument separation and vocals are dreamy, The Game of Love by Daft Punk, the robotic vocals are life like with emotions - but 40 seconds into Wrong Girl by Lindsay Ell and you'll hear her vocals peak and want to run to lower the Croft integrated manual volume knob towards to noon mark (starting point). 

Speaking of which, the Croft Phono Integrated, being a superb hybrid amp, has a lot of gain and is immediate sounding. At 1 o'clock position (noon being the starting point), the sound is comfortable listening at 70db. Turning the volume knob to 2 o'clock it's gets loud to 80db + and 3 o'clock is where you want to turn it down. Never distortion - but enough sweetness and finesse to drive the p3. Loud for the room. 

Metrum DAC has a more or less standard line output level of 2V, and the Croft amp has a relatively sensitive input sensitivity of 250mV. An amp of this sensitivity runs the risk of clipping the voltage waveform before the power stage. Maybe alternative amps have a more relaxed gain structure at the input, sensitive to about a whole Volt. The reason why I am rushing for the volume control as the peas get harsh.

How do I make the famous Harbeth p3esr to sing and show it's true colors of warmth, composure, mature sound, astonishing vocal coming from the diaphragm and the details that it's famous for? How do I listen to hours of different genre music without the need to turn the volume low or move my head up to look at the speakers? Is it the high gain/sensitive Croft Integrated amp or is it the bright Morrow Audio RCA interconnect or maybe the speaker wires? Or maybe the whole set up is a dream and an overkill for the room.

Any feedback by the brilliant minds on this forum with years of experience would be greatly appreciated. With warm regards,

ghulamr
Another good one that ones up for about $1k used on occasion is Bel Canto c5i. I have one and like it very much. If it did not work out Rogue was going to be my next choice but am happy with the smooth liquid sound of the c5i sans tubes. Never ever harsh.  
Better change speakers. P3 is ok for mid and highs but has no bass. For small money you can have a used PMC OB1 and be fully satisfied.

I upgraded from PMC LB1 Signature to Harbeth SHL5. I would take the Harbeth over any PMC which include the big EB1i or IBi. PMC may have good punchy bass but the sound is sterile.
@ryder  do agree 100% 

@mapman Bel Canto is a class D amp and don't think it has tubes. Besides I am avoiding a one box shop with DAC/digital and analog in one. I am very happy with my stand along Metrum Onyx DAC. 
another tweak this morning which helped lower the sensitivity of the amp - using the variable volume at the DSP level in Roon. Now I can adjust how much my DAC is outputting and at 10% reduction have reached a sweet spot on my Croft without compromising sound. One of the advantages of using Roon to leverage the bit perfect volume control floating 64 bits conversion. 
Yes c5i is Class D ( as is Rogue Sphinx) but also all digital, all in 1.   There is phono and line level analog inputs though so external DAC could be used but frankly it has everything one might need save perhaps a MC phono input and it all sounds really good.  Check the reviews online.