I put the Fritz (I’m kinda guessing here based on what I’ve read of them), Joseph Audio, and my Soliloquy speakers in the category of good dynamics and outstanding audiophile characteristics like an expansive 3D soundstage along with pulling off an excellent disappearing act as a sound source. I’d flip that with ATC speakers as they’re very good with the audiophile stuff but are outstanding in the dynamic realm if that helps put it in perspective (at least as I see/hear it). My guess is the ATCs would sound more reminiscent of what you experience with your custom Tekton speakers, but that’s just an educated guess on my part FWIW.
For ATC, the 50s might work in your room but could also be a bit much. I’m confident the SCM 40v2 despite being floorstanders would work as they don’t go all that low and are a sealed design, and you’d still get that magical dedicated dome midrange driver that I really think could be what you’re looking for from what you described with the Tektons (although the 19s certainly share similar characteristics to a lesser degree). Here’s a pair of 40s here that appear to be discounted, and I don’t see any used at the moment.
https://www.audiogon.com/listings/lisb901e-atc-scm40-full-range
Sorry to drone on but hope it’s somewhat useful.