Your speakers are rated at 87dB and 4 Ohms, and it’s probably a good bet they drop below 4 Ohms somewhere in the upper bass/lower mids. I’d be concerned running them with a 90Wpc tube integrated, but maybe you can get some feedback from some other Raidho customers or Raidho on this. Given what you’re looking for and your speaker’s measurements you may want to consider a hybrid integrated with a tube preamp stage and solid state amp. This way you can have ample power, but as you have very specific tastes it also gives you the flexibility to roll tubes to dial in the sound to your liking. The first one that jumps to mind is the Unison Research Unico 90…
https://soundapproach.com/unison-research-unico-90-class-a-hybrid-integrated-amplifier.html
The Rogue Pharaoh might also be worth a look. Pathos also makes some hybrids I believe, but I think they may be a little on the warmer side so not sure they’d be your cuppa. Anyway, just some other options to ponder, and best of luck.