Dear @drbond : " it is an expensive hobby ".
Well it could be as expensive as is the knowledge level of us audiophiles. You made it expensive when choosed your TT with out took in count the additional arm boards price.
As you move up in the learning ladder as lesss expensive could be the hobby.
I think that still own the Atlas and the Koetsu and please let me ask wat's wrong or what dislike you with the 2 tonearms you mated it?
You already have in mind the SAT and SAFIR that considered the first and second " best ":
" if we discuss the technical components of tonearms, does the supposed sonic success of the Kuzma Safir, with an effective mass of 60g, which is possibly only second to the SAT in sonic performance, demonstrate how little is known about how the tonearm actually works in reality? "
SAT is a good design and its main characteristic is its excellent quality levels in manufacture but it's not a tonearm that has any " news/discoveries " to the audiophile tonearm experiences. The real seller of the SAT 9" was its review in Stereophile even at that very high price.
The SAFIR success could be to audiophile " ignorance " on what that dinamyc high mass does to any cartridge suspension and tracking.
Both tonearm were/are the new kids in the block.
Here you can read some objectiv measures on the Helix ( not to good ) and one of your tonearms:
HiFi-News-H2-Dohmann-Review.pdf (dohmannaudio.com)
Btw, normally the top cartridges are designer/manufacture voiced through normal pivot tonearms not underhung ones.
You ask for the VIV that taking in count my last statement seems to me does not to much sense to ask for.
If you can share the why's on your tonearms/cartrisges and this thread will put ligth rigth in the thread and maybe could you have better advise of what you are looking for.
R.