The Denon isn't overly warm at all, but neither is it 'exciting,' spitting 'hf deeeetail' all over the place
I'm out of date here, but the cheaper Ortofon MC's like the X1-MC (below the Vivo Red) were a bit fierce in my day, even for me. I honestly wouldn't put the DL110 anywhere near that bracket and this latter apparently makes a great choice for the stock techie arm. The 110 just gets on with it.
The Dual cartridge you have pictured can be readily improved though and for starters, the Me97XE would be great, as would the Ortofon 520mk2 (Vinyl master something) which comes between the 2M Red and Blue I believe (I NEVER found the OM20 or 520 in either marque as 'difficult' as the 2M Blue).
Yep, the Thorens can be fulfilling in areas that a Rega can't because the latter is so simple. My advice is still to look at the 160 Super updates as inspiration, as these genuinely suited this design well (heavier rubber mat with good contact area, more solid plinth AND BASE).
Good luck