I put this down to two things - either not taking enough care and attention setting up, or the speakers just aren't right for the room.
Show in hotel rooms. Same size/shape as your average bedroom/living room
As both are 40/45years old Condition/Recent service important
£2,000 Benz might be overkill & Benz is Low 15cu compliance suited to Med/High mass arm
You might have to add mass to Tonearm Eg heavier headshell
Neutral / Flat speakers only if have you have a totally treated room
Sound is 75% your room not your speakers
Fantastic speakers in a poor room will sound terrible , Average speakers in a great room will sound Fanstatic
Modern Studio monitors can to tuned to your room with Software / DSP /...
£2750 Hegel high price for made in China by a 3rd party
£2750 gets you a made in the UK like Sugden that will last decades & future value will be higher
ML is a very basic , lost low ML profile with low 300/500hours lifespan. If you want a A.T. ML aim for the higher spec SLC eg ( VM760SLC )
https://www.vinylengine.com/turntable_forum/viewtopic.php?f=19&t=138724
Goldring DG900 are in high demand $250/350 these days with a NEW Jico stylus worth $400/600
https://www.ebay.co.uk/itm/167971032001?msockid=153bc643f42463b1051fd0cdf5c4628e
Acos in japan made the Tonearm , Rega R200 $200/300 in good condition