I have Soliloquy 6.2s — no longer in business but think Joseph Audio RM25XL and that’s basically their sound profile. Very natural sounding with excellent 3D imaging/soundstage. Since you asked, here’s a review I wrote of them 20 years ago (yikes!!!) in case it gives you any further useful info. And yes, I’m still using the same McCormack amp although I recently sprang for their most recent and top upgrades to the tune of around $2700. Frankly I think the DNA-225 probably sounds much more alike (and much more powerful) than different from my now fully-upgraded DNA 0.5. I obviously bought the review speakers and still love them and will likely never let them go.
https://www.soundstagenetwork.com/revequip/soliloquy_62.htm
If you don’t think your Focals are bright the DNA-225 will do nothing to make them sound bright and will very likely bring them even more to life with its great tonality, transparency, and huge reserves of power. I’d think the Parasound A21+ would also be a very nice upgrade if you’re more comfortable sticking with the brand. Honestly I can’t see you going wrong either way as these are both very musical and all-around exceptional amps IMHO. If anything I think either of these amps will make your speakers sound even more refined and just bring out more of what you already like about them. And, if ever you get “the itch” to eventually upgrade your speakers you can be confident either of these amps will continue to serve you very, very well. FWIW.
Oh, forgot to mention if you go the McCormack route you have the option in the future of sending it to SMcAudio and getting their excellent and significant upgrades if you ever want to take the amp to another level. They’re excellent to deal with BTW if you ever have any questions/issues.