I don't think I've ever tried any of those, save the Erl. Interest piqued.
Good post OP... very in depth.
Now that I think of it, in the evolution of vaping in the last few years, I recall that after the first flurry of RBA's (genesis), when RDA's made their debut, with micro coils and cotton balls, I felt they beat genesis' in flavor.
Then came the RTA's.
RDA designs flourished riding the cloud chasing phenomenon.
In most "what is the best flavor RDA" threads I found that the consensus was in agreement with your findings and yeah certain RDA's were more flavorful than the straight up flat base, multi coil, big air holes cloud chasers, but not on par with KF types.
Myself I just simplified my opinion that the more coils and air brought a diminishing return in the flavor dept, and for over a year now have preferred the Prometey2 RTA (and a little more recently the Achilles Ti dripper), both from Ti Modders Group Ukraine which are single coil, and have raised central under-coil air posts and pos/neg posts, and some really good Japanese cotton. Very easy to set up
The P2 has a filler in the large top chamber, and the elevated posts allow for about a ml of juice at the base.
The Achilles has no filler, but does have deep juice wells.
(I much prefer these over my Magma, I guess because I like single coils for some reason).
I use b/f versions of Magma and Origen2 on my sub ohms Reo Grands, both dual coils, good flavor and great for on the road.
I recently ordered an Erlkonigin (sp?) just to try another KF type of RTA again, and Ti modders group just came out with the Ataman Ti RTA too.