Ok, so I just did this by-ear adjustment myself; it's around 1.75 on both force (VTF) and anti skating with my Ekos SE/1 and Adikt. Although I think the VTF is best a bit closer to 1.7 than 1.8, so maybe I should say 1.73. Anti skating seems perfect at 1.75.
To summarise, I'm writing a list arranged like this:
Member, arm, cartridge, VTF on arm, Anti-skating on arm, [measured VTF with digital scale]
markiteight, Ekos 1, Lyra Dorian, 1.7, 1.75-1.8, [-]
Charlie1, Ekos SE, Akiva, 1.73, 2.03, [1.84] (this was your first report, after that I got confused)
Erik, Ekos SE/1, Akiva, 1.75, 1.8, [-]
kallesprätt, Ekos 2, Adikt, 1.73, 1.82, [1.83]
Thomas, Ittok LVII, Adikt, 1.7, 1.7, [1.62]
finster, Ekos 2, Lyra Kleos, 1.7, 1.9, [1.72]
sittertal, Ekos 2, Kandid, 1.72, 1.9, [-]
paolo, Ekos SE/1, Kandid, 1.75, 1.78, [1.84]
lejonklou, Ekos SE/1, Adikt, 1.73, 1.75, [-]
Time to present the theory!
Paolo came up with this idea, not me. He said that he'd been trusting the reading of his digital scale when setting the VTF, but lately he's tried setting it by ear instead and found he got better results that way.
I think he's onto something very interesting here. Because if you set the VTF entirely by ear, it seems you always end up with between 1.7 and 1.75 on the scale of the arm. When you later measure with a digital scale, it can show either more or less (often in the region of 1.6 to 1.9). But adjusting the VTF setting of the arm in an attempt to get the "correct" reading on the digital scale will make your turntable less tuneful.
If we look at the numbers above, the theory that Linn arms should always be set to between 1.7 and 1.75 appears to be confirmed - at least on this list. Which conclusion can be drawn if the theory proves to be true, all of the time? That the optimal VTF setting of the arm has to do with the arm, not the cartridge! It appears that the arm performs best with a certain tracking force setting, and as the arm is more important than the cartridge (in the hierarchy of the turntable), this is more important to the final result than the actual VTF applied to the cartridge.
Why would the arm perform best with a certain tracking force setting? I don't know. It could be due to a resonant frequency in the spring that creates the VTF. Or maybe anyone has a better theory?
Please keep doing this by-ear adjustment and report the results! And if you later change your best setting because a digital scale shows a different number, please keep in mind that you may be fooling yourself.