FWIW, Peter sent me an inquiry through Audiogon's private messaging system, to which I sent a reply on Dec.11.
Although Peter has therefore had the information that he was looking for, let me quote the relevant text from my reply, for the benefit of other users of the Etna, Atlas, Kleos or Delos, and have similar questions.
"I consider it more important to keep under 1.75g than make the angle between cantilever and cartridge body 90ª. Adding stress to the suspension is never recommended, and it is common that the suspension will settle somewhat over time."
"FWIW, the tracking force that gives the best sound seems to vary depending on the tonearm (the turntable suspension is likely to also play a role). It will further depend on the ambient temperature in your audio room, with 22~23ºC being optimal, higher room temperatures potentially benefitting from less VTF, and lower room temperatures potentially benefitting from more VTF (without exceeding 1.75g)."
"I haven't heard of too many customers preferring 1.75g. Some of our customers prefer the sound at 1.72g, while others prefer 1.68~9g."
A secondary query: is there any theoretical/practical advantage to using shorter mounting bolts than the ones my dealer has chosen to fit the cartridge to my Linn Ekos SE?
"As long as the mounting bolts are long enough to engage the screw threads of the Etna body completely, it is fine to try shorter bolts than what your dealer fitted. Personally I try to choose bolts that are no longer than necessary."
Merry Christmas and a Happy New Year to all!
kind regards, jonathan