Sorry to hear you got Covid but glad it was mild. Same here. Let's hope Omicron is the beginning of the end of the pandemic.
Also glad you're gelling with the RS6. For the longest time I thought I found my perfect DAP in the R8, but once you hear the RS6 and its natural tonality (especially vocals), it's hard to go back to a more digital/technical sounding DAP (I still consider the R8 fairly 'musical' but RS6 is another level, even if it doesn't have the uber technicalities of the R8). If HiBy releases an RS8 with the natural tonality of the RS6 and the pristine technicalities, resolution and battery life of the R8, that's endgame for me.
I really liked Nio, and actually the mids were the best part of that IEM for me. Not very technical, mind you, and lacked some resolution (IE900 is better on both fronts) but I found vocals to be clear, full and quite organic. Clearly a YMMV IEM if
@Rockwell75's impressions are anything to go by. I found Trio more resolving but sizzly up top and with thinner vocals. Better, tighter bass than Nio. Fourte would be the logical next step up from Nio, though I prefer Nio's vocals.
Even if I settle on my ideal system, pretty much where I am now, I won't delete my account here. Hanging out on the forums and sharing experiences is the best part of the hobby for me. There's literally one other person in my life who shares my passion for audio, and I don't even bother talking about with with anyone else IRL. So this is really my only outlet.