Interesting amp - if those graphs on the linked page are correct, then it looks like a genuine 80W each channel into 4 ohms. "Runs rings round the Quad 306" - yes, in a way depressingly, that seems to be par for the course with the better Chinese class D amps. They can successfully take on surprisingly good 'conventional' and well thought of amps. VFM is out of sight in terms of sq. And not just class D, I've a Chinese built class A 10wpc transistor amp that is well into audiophile territory for not much over £100.
Can you compare the sound with other class D amps, Dave? - TA2020 and Ta2022 chip amps perhaps? (I'm familiar with those!). The TA 2020 being quite lively and open, the TA2022 taking a somewhat more leisurely view of the music. Still both excellent, though.
Fostex T50RP Mk3. They are the end point of my quite extensive headphone search. "Semi open back" - but the open apertures are small and they leak very little sound. They simply sound better than any other of the many fine headphones I have heard and owned. Open, fast, detailed, dynamic, tonally neutral. Bass goes deep and controlled. Put some Brainwavz earpads on them (£20) and they are astonishingly comfortable and don't heat up your ears as much as many others.
Sounds like a good move to me. It was pretty clear from your previous posts that you were obsessing way too much (even for this crazy hobby) and it was driving you crazy and you were not enjoying the music. Good luck - I hope it works out for you.
MBL 116F speakers, Pass X150 power amp, Pure Sound L10 pre, Cambridge Audio 851D DAC/pre, Spotify Premium streaming